Optical Gratings

Product Portfolio
Together with our partner suppliers, AMS Technologies realizes optical gratings in various forms for a broad range of applications e.g. in optoelectronics, analytical, and defense industries.

Our high-efficiency volume Bragg gratings are based on a special multi-component silicate glass that enables fabrication of gratings with absolute diffraction efficiency >99%, thermal stability of +400°C, a laser damage threshold of up to 40 J/cm2, and tolerance to CW laser radiation in the near IR region at least up to several tens of kilowatts per square centimeter. Reflecting, transmitting and chirped volume Bragg gratings are available, providing narrow spectral selectivity down to 20 pm and narrow angular selectivity down to 100 μrad.

Our broad range of fiber Bragg gratings (FBGs) have many applications in optical communication, laser technology and sensing systems. Within our series of standard-types fiber Bragg gratings, you find uniform, apodized, chirped, and apodized-chirped fiber Bragg gratings, as well as fiber laser matched fiber Bragg grating pairs, tilted, and π-phase-shifted fiber Bragg gratings.

Optical sensors based on our femtosecond fiber Bragg gratings allow to monitor temperature, pressure, and deformation of such objects that previously hadn`t been eligible for fiber sensing. Our series of tunable fiber Bragg gratings is a good solution for many applications – including those requiring a corrected central Bragg wavelength. And our athermal packaged fiber Bragg gratings allow customers to achieve all advantages of fiber Bragg gratings, while preserving a high wavelength stability within a wide temperature range.

Within our series of specific application fiber Bragg gratings, you find wavelength locker FBGs, WDM ITU filter 100/200 GHz FBGs, Raman laser, and Fabry-Perot interferometer FBGs, as well as FBGs for hard environments, and radiation-hard FBGs.

All of our optical gratings’ configurations can be changed at the customer's request, please contact AMS Technologies to discuss an application-specific, customized optical grating solution tailored to your project’s requirements.

Related Products
Complementing our optical gratings offering, AMS Technologies can supply a broad portfolio of fiber sensing equipment, including interrogation systems for measuring strain, pressure and temperature using fibers with Bragg Gratings inscribed. Our devices transform a single optical fiber into up to several thousand sensors, enabling seamless measurement and monitoring of large structures from aircraft wings to bridges or pipelines.

Optical gratings are intended for applications with light sources. AMS Technologies carries a broad portfolio of lasers and light sources, encompassing LED, SLED, broadband, ASE and supercontinuum light sources, as well as laser sources like DPSS lasers, diode lasers, gas lasers, OPOs and tunable lasers or other lasers and light sources – and also including an exceptionally broad portfolio of laser diodes, modules and systems for a wide variety of wavelengths and optical output powers.

We also carry a broad range of complementary optics products such as optical lenses, fiber collimators and focusers, lens holders and lens positioners as well as MWIR or LWIR thermal imaging assemblies. Other available precision optics include optical windows, prisms or optical filters. All featuring high precision, smallest tolerances (dimensional and angular) and special coatings for exotic wavelengths, even into the UV spectral range.

Additionally, we carry a broad range of complementary products such as optical mounts, rotary and translation stages, optical tables, breadboards and platforms, as well as a broad range of optical test and measurement equipment.

Definition
Optical gratings (also: diffraction gratings) are periodic structures used to diffract light. Optical gratings consist of parallel, line-like structures, where the grating constant is the period of the grating. If coherent light falls on a grating, the light diffracted at the individual grating lines interferes and forms an interference pattern. Monochromatic light is deflected in few different directions, with the angles of deflection depending on the grating constant and the wavelength, while polychromatic (e.g. white) light is spread out into its spectrum, similar to an optical prism.

Optical gratings are used in optical measuring devices to monochromatise radiation (monochromator) and to analyse spectra (optical spectrometer). Other examples of applications include frequency stabilisation of lasers, amplification of short high-power laser pulses, channel separation or merging in optical data transmission, and the use of optical gratings in optical fibers as sensor elements.

Optical Bragg gratings are transparent components in which periodic modulations of the refractive index are inscribed – usually by means of UV light. This Bragg structure forms an optical interference filter whose center wavelength satisfies the so-called Bragg condition. Wavelengths that lie within the filter bandwidth around this center wavelength are reflected. If the length of the grating is long enough, only a weak modulation of the refractive index around the Bragg wavelength can be sufficient for an approximately total reflection. All other wavelengths are only very slightly affected by the Bragg grating. With transmission and reflection being wavelength-dependent, a Bragg grating can be used as an optical filter.

Bragg gratings inscribed in a bulk piece of glass or polymer by UV radiation and subsequent heat treatment are called volume Bragg gratings. Due to the large interaction length and the use of special glass, it is possible to produce volume diffraction gratings with a diffraction efficiency of more than 99%, which are suitable for high temperatures and large optical radiation powers. Typical applications for volume Bragg gratings are narrow-band filters for lasers with low temperature dependence, stabilisation or tuning of the wavelength of laser light, or spectral beam combining.

In fiber Bragg gratings, individual layers inscribed in an optical fiber by means of UV light create a periodic modulation of the refractive index in the fiber core and thus an optical interference filter (bandstop) that reflects the light of a specific wavelength λ. Successive sections of length λ/2 are in turn composed of two λ/4 pieces with different refractive indices. Fresnel reflection of part of the injected amplitude occurs at each interface. The periodic change of the refractive index or the wave impedance causes the phase of the reflected wave to step either 0° or 180° at the end of each λ/4 piece. Multiple reflection results in constructive interference.

Here, the effective refractive index depends on the fiber geometry (core and cladding diameter), the difference in refractive indices and the wave modes. The spectral width of the filter’s wavelength band is determined by the length of the fiber Bragg grating and the refractive index difference between the adjacent regions. As this difference is not very large for manufacturing reasons, full amplitude cancellation is not possible with too few consecutive layers.

Fiber Bragg gratings are used, among other things, to filter out wavelength components from fiber laser light, to stabilise their wavelength, or to linearise the gain of fiber amplifiers. However, fiber Bragg gratings are also suitable as fiberoptic sensors. For example, it is possible to detect when a fiber is stretched or compressed – the deformation of the fiber changes the grating period and thus the Bragg wavelength of the grating. A fiber Bragg grating can also be used as a temperature sensor as the refractive index of the fiber material changes with temperature due to the thermo-optical effect.

The use of fiber Bragg gratings as a sensor is particularly attractive because a large number of such gratings can be inscribed in a single fiber at intervals of a few millimeters to a few kilometers, and the fiber can thus be used as a multipoint sensor that can be excited and read out via only one common interrogator unit. If the individual grating structures are arranged accordingly, each of these grating elements can also record other parameters such as acceleration, pressure or displacement – thus the fiber turns into a multifunctional sensor.

Alternative Terms: Fiber Bragg Grating; Volume Bragg Grating; Bragg Reflector; Bragg Grating Sensor Fiber; Diffraction Grating; Transmitting Bragg Grating; Reflecting Bragg Grating; Chirped Bragg Grating; Apodized Bragg Grating; Femtosecond Bragg Grating; Tilted Bragg Grating; Phase-shifted Bragg Grating; Tunable Bragg Grating

Chirped Volume Bragg Gratings

Wavelength 600-2500 nm; Bandwidth 0.2-100 nm; Diffraction Efficiency 5-99%; Thickness Up to 50 mm; Aperture Up to 20x20 mm OptiGrate’s chirped volume Bragg gratings (CBGs) are diffractive optical elements operating as reflecting Bragg gratings with a period gradually varying along direction of beam propagation. This feature results in reflection of different wavelengths from different holographically recorded planes inside the grating. OptiGrate’s BragGrate™ Pulse is the first commercially available Chirped Bragg Grating (CBG) based product designed for the stretching and compression of ultra-short (femtosecond and picosecond) laser pulses in Chirped Pulse Amplification (CPA) and other Ultra-Short Pulse Laser (USPL) systems. It is the most compact and robust stretcher/compressor solution for high-energy and high-average-power ultra-short pulsed laser systems. The BragGrate™ Tuner is a reflecting volume Bragg grating with chirped period in one direction across its aperture, recorded in a bulk of photosensitive silicate glass. BragGrate™ Tuners can be used as an output coupler or HR mirror in a laser resonator. It enables both spectral stabilization and tuning of the laser radiation. High laser damage threshold makes these gratings suitable for usage in high-power and high-energy pulsed lasers. Tunable lasers based on these components are simple, compact, and robust. Simple linear translation of grating without angular adjustment is needed for wavelength tuning. Lasers with BragGrate™ Tuners can operate in selective laser melting (SLM) regime. Key Features: Compact Geometry and Easy-to-align Ideal for Industrial and Scientific Applications High-power Operation: Up to 1 kW Average Power High-energy Operation: Up to 2 mJ Pulse Energy Environmentally Stable Robust, Easy to Handle and Clean Multiplexed Gratings for Idle/Signal Control (BragGrate™ Tuner) Stretcher and Compressor in One Element Operating Range: 600 nm to 2500 nm Typical Center Wavelength: 1030 nm Spectral Bandwidth: 0.2 nm to 100 nm; 50 GHz to 500 GHz Typical Spectral Bandwidth for 1030 nm Spectral Range: 5 nm to 25 nm Tuning Range: >20 nm; 1 nm to 30 nm Chirp: Linear Across Full Aperture High Operation Temperatures Continuous Tuning, No Mode-hops Wide-range SF Tuning Compact/Simple Cavity Design Thickness: Up to 50 mm Typical Thickness for 1030 nm Spectral Range: 20 mm to 45 mm Stretching Time (FWHM): Up to 0.5 ns Efficiency: 5% to 99% Typical Diffraction Efficiency for 1030 nm Spectral Range: >85% Apertures: Up to 20 x 20 mm² M2: <1.3 Typical Stretching Time (FWHM) for 1030 nm Spectral Range: ~ 300 ps Typical Dispersion Rate for 1030 nm Spectral Range: ~ 6, 12, 25, 60 ps/nm (Linear) Typical Compressed Pulse Duration for 1030 nm Spectral Range: <200 fs Applications: Stretcher and Compressor for Ultra-short Pulse and Chirped-pulse Amplification (CPA) Laser Systems; Industrial; Scientific; Tunable Output Coupler; Tunable Total Mirror; Tunable Filter; Spectral Beam Combination

Product number: SW11878

Manufacturer: OptiGrate

GTL-FBG-AP-850 Athermal Packaged Fiber Bragg Gratings

Wavelength 600-2300 nm; Bandwidth 0.05-1.2 nm; Reflectivity 5-99%; SLSR >8 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) are sensitive to changes in temperature, their thermal sensitivity is about 6.7 ppm/K (+0.11 pm/K @1550 nm). FORC Photonics’ GTL-FBG-AP-850 athermal packaged fiber Bragg gratings are intended for passive compensation of the FBG’s thermal sensitivity by matching the case elements’ expansion with the FBG’s wavelength shift under the influence of temperature. This technology allows customers to achieve all advantages of fiber Bragg gratings, while preserving a high wavelength stability within a wide temperature range. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized athermal packaged fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 600 nm to 2300 nm Wavelengths to Quick Order [nm]: 633, 780, 794, 797, 799, 801, 809, 830, 852, 895, 940, 976, 1030, 1057, 1060, 1064, 1080, 1125, 1150, 1178, 1240, 1270, 1310, 1484,1510 ÷ 1580, 1650, 1900, 1908, 1952, 2300 Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Thermal Wavelength Stability (0°C to +70°C): <0.16 nm Reflectivity: 5% to 99% Bandwidth (WFHM): 0.05 nm to 1.2 nm FBG Length: 1 mm to 20 mm SLSR: ~8 dB FBG Pigtail Length: ≥0.5 m Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions: 66 x 18 x 12 mm Applications: Passive Compensation of FBG Thermal Sensitivity; Applications Requiring High Wavelength Stability in a Wide Temperature Range

Product number: SW11874

Manufacturer: FORC Photonics

GTL-FBG-FS-880 Femtosecond Fiber Bragg Gratings

Wavelength 1000-2300 nm; Bandwidth 0.05-1 nm; Reflectivity 0.01-95%; SLSR ~8 dB; Fiber Type SM, PM, Double Clad, LMA, Radiation Resistant, Custom; Fiber Pigtail Length ≥0.5, Custom FORC Photonics’ GTL-FBG-FS-880 type femtosecond fiber Bragg gratings (FBGs) can be written into all optical transparent fiber materials with a broad variety of fiber coatings – without the need to strip the coating from the fiber and recoating it after the FBG writing procedure. Optical sensors based on femtosecond FBGs allow to monitor temperature, pressure, and deformation of such objects that previously hadn`t been eligible for sensing. FBGs written into radiation resistant pure silica core fibers are ideal for applications in the nuclear industry. Femtosecond FBG inscription through the fiber’s protective coating yields excellent mechanical strength – very important in strain sensing applications. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized femtosecond fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 1000 nm to 2300 nm Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Radiation Resistant, Custom Reflectivity: 0.01% to 95% Bandwidth (WFHM): 0.05 nm to 1 nm SLSR: ~8 dB FBG Pigtail Length: ≥0.5 m FBG Inscription Through the Fiber’s Protective Coating: Acrylate, Polyimide, Custom Additional FBG Coating (on Request): Aluminium, Copper, Custom Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Applications: Monitoring Temperature, Pressure & Deformation; Nuclear Industry

Product number: SW11872

Manufacturer: FORC Photonics

GTL-FBG-TB-890 Tunable Fiber Bragg Gratings

Wavelength 600-2300 nm; Bandwidth 0.05-1.2 nm; Reflectivity 5-99%; SLSR >8 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom FORC Photonics’ GTL-FBG-TB-890 tunable fiber Bragg gratings (FBGs) are a good solution for many applications – including those requiring a corrected central Bragg wavelength. An FBG’s central wavelength strongly depends on applied stress, with the mechanically induced strain linearly shifting the FBG’s central wavelength. The tunable fiber Bragg grating wavelength’s relative strain sensitivity is 0.78 * 10-6 µstrain-1. GTL-FBG-TB-890 tunable fiber Bragg gratings are boxed and operated manually. Athermal performance with an adjustment range of 2 nm is also possible. The gratings are available as bare fibers or with a variety of optical connectors. The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized tunable fiber Bragg grating solution tailored to your project’s requirements. Key Features: Wavelength Range: 600 nm to 2300 nm Wavelengths to Quick Order [nm]: 633, 780, 794, 797, 799, 801, 809, 830, 852, 895, 940, 976, 1030, 1057, 1060, 1064, 1080, 1125, 1150, 1178, 1240, 1270, 1310, 1484,1510 - 1580, 1650, 1900, 1908, 1952, 2300 Fiber Type: Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Thermal Wavelength Stability (0°C to +60°C): <0.18 nm Reflectivity: 5% to 99% Bandwidth (WFHM): 0.05 nm to 1.2 nm FBG Length: 1 mm to 20 mm Adjustment Range: 2 nm SLSR: >8 dB FBG Pigtail Length: ≥0.5 m FBG Recoating: On Customer Request Tensile Strength: >100 kpsi Optical Connector: Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions: 66 x 18 x 16 mm Applications: Where Corrected Central Bragg Wavelength is Necessary

Product number: SW11873

Manufacturer: FORC Photonics

Reflecting Volume Bragg Gratings

Wavelength 350-2700 nm; Bandwidth 0.02-20 nm; Diffraction Efficiency 3-99.7%; Thickness 0.50-20 mm; Aperture Up to 10x10-50x50 mm OptiGrate’s reflecting volume Bragg gratings (RBGs) are diffractive optical elements operating in reflecting geometry when a diffracted beam crosses the grating surface frontally oriented to an incident beam. One of the particular cases of this geometry is the retro-reflection of an incident beam. Several products based on RBG elements with different reflectivity are available: OptiGrate’s BragGrate™ Mirror is a reflecting volume Bragg grating recorded in a bulk of photosensitive silicate glass, suitable for laser mode selection and diode laser wavelength locking with a reflectivity range from 5% to 99% for spectral and thermal management of lasers. Incorporated in a laser resonator, a BragGrate™ Mirror enables the laser line spectral narrowing and thermal stabilization and can withstand high optical energy up to 5 J/cm2. The laser modal structure is controlled by the longitudinal mode selection with the bandwidth down to 20 pm and the customized central wavelengths with an accuracy of 0.1 nm to 0.5 nm. BragGrate™ Mirrors have record low absorption and allow thermal laser wavelength shift reduction to 5 pm/K @532 nm. BragGrate™ Notch Filter is a reflecting volume Bragg grating with very high diffraction efficiency, typically in a range of 90% to 99.9%, recorded in a bulk of photosensitive silicate glass. It serves as a ultra-narrow band-stop filter reflecting one narrow line (as narrow as 5 cm-1) out of the transmitted laser beam, while all other wavelength pass unaffected with up to 95% total transmission. These volume Bragg gratings enable simultaneous measurements of Stokes and Anti-Stokes Raman bands down to 5 cm-1 with a single-stage spectrometer. Our notch filters can withhold temperatures of up to +400°C and are fully environmentally stable with a practically unlimited lifetime. Central wavelengths of the filters can be angle-tuned by several nanometers without reduction of the filter optical density. BragGrate™ Combiner is a high reflectivity (90-99%) volume Bragg grating (or sets of gratings) that is used for spectral beam combining (SBC). This element enables combining of laser radiation from multiple sources with offset wavelengths into a single, nearly diffraction-limited beam with increased brightness. SBC by means of our BragGrate™ Combiner is a simple and robust technique for combining high-power laser radiation with a record spectral brightness. Excellent mechanical properties and a refractive index that is independent of temperature enables the combiners to withstand high-power laser radiation, thus making the components the ideal element for high-powered SBC. BragGrate™ Bandpass Filter is a reflecting volume Bragg grating (RBG) recorded in a bulk of photosensitive silicate glass. These filters are used to clean up laser spectral noise with a bandwidth as narrow as 50 pm in visible and near IR regions. In Raman spectroscopy applications, combining these Filters with matching BragGrate™ Notch Filters enables Raman shift measurements down to 5 cm-1 from the laser line. The widely used BragGrate™ bandpass filters have superior environmental stability and can handle high power optical radiation and high operations temperatures. Imperfections in laser optics and variations in laser gain medium cause side fringes and spatially varying intensity. Our BragGrate™ Spatial Filter is designed to “clean up” laser beams from these deficiencies. BragGrate™ Spatial Filters provide a simple, compact, and cost-effective solution for laser beam spatial filtering. They are based on reflecting volume Bragg gratings with a narrow acceptance angle that enables filtering of laser beams with a single element, thus replacing pinhole assemblies in case of narrow line laser sources. In addition to spatial filtering, BragGrate™ Spatial Filters provide ultra-narrow-line spectral filtering, can be used for high-power/high-energy applications, have superior environmental stability, and can handle high-power optical radiation and high operations temperatures. Key Features: High-power Operations: >1 kW, Up to 10 kW High-energy Operations: Up to 5 J/cm2 Superior Environmental Stability, No Degradation Over Lifetime No Polarization Dependence BragGrate™ Mirror BragGrate™ Notch Filter BragGrate™ Combiner BragGrate™ Bandpass Filter BragGrate™ Spatial Filter Wavelength Range [nm] 350 - 2700 400 - 2500 400 - 2700 400 - 2500 400 - 2300 Standard Center Wavelengths [nm] 405, 6XX, 7XX, 8XX, 9XX, 10XX, 15XX, 19XX 488, 514.5, 532, 632.8, 785, 1064 930-980, 1030-1100 405, 488, 514, 532, 633, 785, 1064 Standard Spectral Bandwidth (FWHM) [nm] 0.1 - 0.3 <10 cm-1 0.2 - 0.5 <7 cm-1 - Spectral Bandwidth [nm] 0.02 -0.5 - 0.05 - 20 1.5 - 10 - Diffraction Efficiency (DE) [%] 3 - 99.7 - 90 - 99 >90 - Lateral Dimensions [mm²] 1.5 × 2, 1.5 × 12, 5 × 5, 8 × 8 12.5 x 12.5, 11 x 11 15 x 15, 20 x 20 5 x 5 Up to 25 x 25 Grating / BNF Thickness [mm] 0.50 - 20 2 - 4 0.50 - 10 1.5 - 10 2 - 5 Apertures [mm²] Up to 35 × 35 Up to 25 x 25 Up to 50 x 50 Up to 10 x 10 - Angular Selectivity/Acceptance [mrad] 1 - 100 0.1 - 0.2 0.5 - 10 - <5 Incident/Output (Diffracted) Angles [deg] 0 - 45 0 - 45 5 - 45 5 - 90 5 - 90 Key Features BragGrate™ Mirror: Low to No Power Penalty Narrowing of Laser Line Down to 20 pm With Superior Thermal Stability Unique Solutions to Achieve SFM Oscillations Near-diffraction-limited Beam Quality Key Features BragGrate™ Notch Filter: Ultra-narrow Rejection Bandwidth Measurements of Both Stokes and Anti-Stokes Modes Key Features BragGrate™ Combiner: High Spectral Selectivity Near-diffraction-limited Beam Quality Key Features BragGrate™ Bandpass Filter: High Spectral Selectivity Near-diffraction-limited Beam Quality Key Features BragGrate™ Spatial Filter: Spatial Filtering Without Refocusing and Pinhole Assembly Highly Cost-effective and Small Footprint Easy Alignment by Angle-tuning in Standard Kinematic Mount Simultaneous Spatial and Spectral Filtering (<5 cm-1 to Laser Line) Supports Operation at Temperatures up to +400°C Applications: Longitudinal and Transverse Mode Selection in Laser Resonators; Solid-state Lasers; High-power Diode Lasers; MM and SM Diode Lasers for Spectroscopy; Fiber Lasers; Laser Radars; LIDARS; Ultra-low Frequency Raman Spectroscopy; Raman Imaging; Thomson Scattering; High-power Spectral Beam Combining; Filtering of Spatial Noise in Laser Beams; Ultra-narrow Linewidth Spectral Filtering of Laser Beams; ASE Filters for Diode Laser Sources; Wavelength-tunable Spatial and Spectral Filters

Product number: SW11876

Manufacturer: OptiGrate

Specific Application Fiber Bragg Gratings

Wavelength 600-2300 nm; Bandwidth 0.1-1.2 nm; Reflectivity 0.5-99.9%; SLSR ~8, ~10 dB; Fiber Type SM, PM, Double Clad, LMA, Radiation Resistant, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) have many applications in optical communication, laser technique and sensing systems. FORC Photonics’ series of specific application FBGs are widely used for applications like in-fiber mirrors or optical filters with narrowband optical spectrum. Fiber Bragg gratings also are one of the most popular elements in the field of fiber-optic sensing. Within FORC Photonics’ series of specific application fiber Bragg gratings (FBG) you find: Wavelength Locker FBGs WDM ITU Filter 100/200 GHz FBGs Raman Laser FBGs Fabry-Perot Interferometer FBGs Hard Environment FBGs Radiation Hard FBGs GTL-FBG-WL-810 wavelength locker fiber Bragg gratings are used as external reflectors for laser diodes. With the help of these FBGs it is easy to stabilize the wavelength generation of pump semiconductor lasers and single-frequency lasers. Low-reflection gratings with a full width at half maximum (FWHM) bandwidth of 0.3 nm to 0.8 nm and a reflectivity of 2% to 5 % are ideal for stabilizing pump power lasers. FBGs with FWHM bandwidths around 0.1 nm and reflections of 10% to 20% are used close to semiconductor laser crystals for creation of single-frequency sources. FORC Photonics provides wavelength locker FBGs with very accurate wavelength positions (up to ±0.02 nm). FORC Photonics’ GTL-FBG-WDM-810 series of WDM ITU Filter 100/200 GHz fiber Bragg gratings with narrow spectral bandwidth are good elements for filtering optical signals. Such FBGs are widely used as optical add/drop multiplexer in WDM systems. A high level of SLSR is allowed to avoid adjacent channel crosstalk in systems. These FBGs feature a flat-top reflection spectrum and steep spectral roll-down. Athermal packaging of the FBG with wavelength stability <0.16 nm for a temperature range of 0°C to +70⁰C is required for stable operation. Highly efficient multi-cascaded Raman lasers based on phosphosilicate fibers can be created at different wavelength using our GTL-FBG-RL-880 Raman laser fiber Bragg gratings. Compared to Germanium-doped fibers, an approximately three times larger Raman shift can be achieved. For many applications where very small temperature or strain changes have to be measured using acoustic waves, the sensitivity can be enhanced by using pairs of FBGs. A Fabry-Perot interferometer based on FORC Photonics’ GTL-FBG-FPI-810 Fabry-Perot interferometer fiber Bragg gratings is such a pair of FBGs, allowing to detect a small phase shift. By coating the fiber between the gratings with an electric, magnetic or acoustic enhancing coating, very small changes of these fields can be measured. For sensing purposes and to evaluate small vibration or acoustic signals via an interferometric method, it is often sufﬁcient to work with a low-finesse Fabry-Perot cavity. GTL-FBG-HE-810 hard environment fiber Bragg gratings can be provided as separated or chains of FBGs with different wavelengths, allowing for multipoint temperature monitoring. Different types of single mode (SM) optical fibers and fiber coatings can be used for writing these gratings. High-temperature acrylate coated fibers apply for temperature ranges up to +150°C. Polyimide or metal (Cu, Al) coated fibers are used for high-temperature applications with maximum temperatures of +300°C and +500°C respectively. Using a steel tube protection, our hard environment FBGs can be applied up to +700°C. GTL-FBG-RH-880 radiation hard fiber Bragg gratings written in radiation resistant pure silica core fibers are ideal for applications in the atomic energy industry, aerospace and other radiation intense environments. Key Features:The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss an application-specific, customized fiber Bragg grating solution tailored to your project’s requirements. GTL-FBG-WL-810 Wavelength Locker FBGs GTL-FBG-WDM-810 WDM ITU Filter 100/200 GHz FBGs GTL-FBG-RL-880 Raman Laser FBGs GTL-FBG-FPI-810 Fabry-Perot Interferometer FBGs GTL-FBG-HE-810 Hard Environment FBGs GTL-FBG-RH-880 Radiation Hard FBGs Wavelength Range [nm] 630 - 2300 1530 - 1565 (C Bands) or Custom 1510 - 1580 1240, 1270, 1484 600 - 2300 1000 - 2300 Wavelengths to Quick Order [nm] 30 values between 633 and 2300 - - - 30 values between 633 and 2300 - Fiber Type Single Mode (SM), Polarization Maintaining (PM), Custom Single Mode (SM) Corning SMF-28 Single Mode (SM), Polarization Maintaining (PM), Double-clad, LMA, Custom Single Mode (SM), Polarization Maintaining (PM), Radiation Resistant, Custom Single Mode (SM), Polarization Maintaining (PM), Double-clad, LMA, Custom Single Mode (SM), Polarization Maintaining (PM), Radiation Resistant, Custom Reflectivity [%] 2 - 5, 10 - 20 10 - 99, Flat-top Typical > 99.5 5 - 99.9 0.5 - 99 Bandwidth (WFHM) [nm] 0.3 - 0.8, 0.1 - 0.15 100/200 GHz on ITU For 100 GHz: @-0.5 dB >0.3 nm, @-20 dB 0.65 nm 0.15 - 1.2 0.3 - 0.8 0.15 - 0.8 0.3 - 0.5 Distance Between FBGs [mm] - - - 1 - 200, Custom - - Channel Isolation [dB] - -20 - - - - Insertion Loss [dB] - <0.15 - - - - Cladding Mode Loss [dB] - <0.5 (Only for Cladding Mode Suppressed Fiber) - - - - SLSR [dB] ~10 - ~8 - ~8 ~8 FBG Pigtail Length [m] ≥0.5, Custom FBG Recoating None, Acrylate, Polyimide, Aluminium, Copper, Custom None, Acrylate, Polyimide, Custom None, Acrylate, Polyimide, Aluminium, Copper, Custom Tensile Strength [kpsi] >100 - >100 Thermal Wavelength Stability (0°C - +70°C) [nm] - <0.16 - - - - Optical Connector Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions LxWxH [mm] - 66 x 18 x 12 - - - - Applications: External Reflectors for Laser Diodes; Filtering Optical Signals; Optical Add/Drop Multiplexer in WDM Systems; Measuring Small Temperature or Strain Changes; Evaluating Small Vibration or Acoustic Signals; Multi-cascaded Raman Lasers; High-temperature Applications; Atomic Energy Industry; Aerospace

Product number: SW11875

Manufacturer: FORC Photonics

Standard Types Fiber Bragg Gratings

Wavelength 600-2300 nm; Bandwidth 0.05-50 nm; Reflectivity 0.2-99.9%; SLSR ~8->15 dB; Fiber Type SM, PM, Double Clad, LMA, Custom; Fiber Pigtail Length ≥0.5, Custom Fiber Bragg gratings (FBGs) have many applications in optical communication, laser technique and sensing systems. FORC Photonics’ series of standard types FBGs are widely used for applications like in-fiber mirrors or optical filters with narrowband optical spectrum and can act as a sensor element for strain and temperature measuring. Within FORC Photonics’ series of standard types fiber Bragg gratings (FBG) you find: Uniform Fiber Bragg Gratings Apodized Fiber Bragg Gratings Chirped Fiber Bragg Gratings Apodized-chirped Fiber Bragg Gratings Fiber Laser Matched Fiber Bragg Gratings Tilted Fiber Bragg Gratings π-Phase-Shifted Fiber Bragg Gratings GTL-FBG-UF-810 uniform fiber Bragg gratings are produced with grating lengths from 0.5 mm to 10 mm. Such gratings show their full width at half maximum (FWHM) from 0.015 nm (R = 25%) to 0.03 nm (R = 90%) for 633 nm wavelength (0.1 nm and 0.17 nm at 1580 nm) and gratings length 9 mm. Standard uniform FBGs have a bandwidth of 0.15 nm to 0.6 nm, a reflectivity of 5% to 99% and grating lengths of 1 mm to 3.5 mm. Fiber Bragg gratings are sensitive to changes of strain and temperature. Uniform FBGs can be provided as separated units or chains of FBGs with different wavelengths. By using chain FBGs, multipoint monitoring of temperature, strain or other physical parameters is available. Different types of single mode optical fibers and fiber coatings are used. Acrylate coated fibers for normal temperature range of -40˚C to +100˚C. Polyimide or metal (Cu, Al) coated fibers are used for high-temperature applications with maximum temperatures of +300˚C and +500˚C respectively. GTL-FBG-AD-820 apodized fiber Bragg gratings show a special profile of induced refractive index and grating strength along the grating length. Therefore, the side lobes level becomes smaller compared to ordinary gratings. There are a lot of apodized profiles which lead to the optimization of various FBG parameters (strength, FWHM, side lobe suppression ratio (SLSR)). Apodized FBGs are useful in sensing applications, signal and Brillouin scatter filtering and others. Possible value of SLSR for different grating strengths is -10 dB to -30 dB. Our GTL-FBG-CR-840 chirped fiber Bragg gratings feature a linear variation of the FBG period along the grating length. Chirped FBGs are manufactured by using a non-periodic phase mask. The available chirp rate of the phase mask period can range from 0.01 nm/cm to 30 nm/cm. Therefore, such FBGs have a wide spectrum bandwidth and special dispersion characteristics. Chirped FBGs are useful for gain-flattening EDFA and ASE light sources, band stop filters, in ultrafast mode-locked fiber lasers, powerful lasers, and chromatic dispersion compensation telecom systems. Apodization of chirped FBG is necessary to obtain FBGs with a smooth reflection spectrum. There are several apodization profiles that lead to the optimization of various parameters of the FBG such as reflection coefficient, FWDM, side lobe suppression ratio (SLSR), or the parameter of dispersion. In chirped FBGs the dispersion is determined by the rate of change of the period along the length of the FBG. Within the GTL-FBG-ADG-820 series of apodized-chirped fiber Bragg gratings, FORC Photonics has implemented several types of apodization profiles: Sine, Gauss, Semi Gauss and Super Gauss. The simplest type of apodization is "Sine", which "saves" the length of the FBG and provides a (SLSR) value of about 20 dB. The "Gauss" apodization function provides the best SLSR value in the order of 30 dB. For many applications, such as pulsed fiber lasers, there are special requirements for the dispersion value and the shape of the reflection profile. "Gauss" apodization of chirped FBGs allows to obtain excellent results in these applications. The "SuperGauss" type of apodization is intended for obtaining a flat-top reflection spectrum. Apodized FBGs are useful in sensing applications, signal and Brillouin scatter filtering and others. Our GTL-FBG-LP-830 fiber laser matched FBG pairs are an ideal solution for fiber laser fabrication. Minimum insertion losses and other parameters are optimal for lasers with output powers of several tens of W. High- and low-reflection gratings are available, with the high-reflection grating showing -20 dB levels of about 0.5 nm to 0.7 nm. The low-reflection output grating with 5% to 40% reflectivity has FWHM values of 0.15 nm to 0.35nm. The mismatching of LR relative to HR grating is up to ±0.15 nm. For narrow-line fiber lasers we provide FBG pairs with FWHM values around or below 0.1 nm for ideal matching without adjustment. GTL-FBG-TL-860 tilted fiber Bragg gratings have an angle between the wave vector of the grating and the fiber axis. Therefore, cladding modes resonance peaks become more intensive compared to ordinary gratings. The wavelengths of tilted fiber Bragg gratings cladding modes resonances are highly sensitive to the refractive index of the medium outside the fiber cladding. TFBGs are useful in sensing applications. Possible values of the tilt angle are 1⁰ to 45⁰. GTL-FBG-PS-870 π-phase-shifted fiber Bragg gratings have a very narrow peak within their transmission/reflection spectrum. Phase-shifted FBGs are gratings with a phase defect in the center. While the grating length determines its bandwidth, the spectral width of that peak depends on the strength of the FBG’s both parts. Typical FWHM values for our π-phase-shifted fiber Bragg gratings are 0.1 nm to 0.005 nm. A typical application of phase-shifted FBGs are narrow-bandwidth optical filters for single-frequency fiber lasers. Key Features:The following configurations can be changed at the customer's request, please contact AMS Technologies to discuss a customized fiber Bragg grating solution tailored to your project’s requirements. GTL-FBG-UF-810 Uniform FBGs GTL-FBG-AD-820 Apodized FBGs GTL-FBG-CR-840 Chirped FBGs GTL-FBG-ADG-820 Apodized-chirped FBGs GTL-FBG-LP-830 Fiber Laser Matched FBG Pairs GTL-FBG-TL-860 Tilted FBGs GTL-FBG-PS-870 π-phase-shifted FBGs Wavelength Range [nm] 600 - 2300 Wavelengths to Quick Order [nm] - - 1069, 1081, 1529, 1875 30 values between 633 and 2300 Fiber Type Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom SM, PM, Double Clad, Custom Single Mode (SM), Polarization Maintaining (PM), Double Clad, LMA, Custom Reflectivity [%] 0.2 - 99.9 0.5 - 99.9 5 - 99 5 - >99 5 - 99 Tilt Angle - - - - - 1° - 45° - Chirp Rate [nm/cm] - - 0.01 - 30 0.01 - 25 - - - Bandwidth (WFHM) [nm] 0.05 - 1.2 0.1 - 1.2 2 - 50 0.5 - 50 0.1 - 1.2 0.1 - 0.8 Grating (FBG) Length [mm] - - 2 - 50 - - - - SLSR [dB] ~8 >10, >15 ~8 >15 - ~8 FBG Pigtail Length [m] ≥0.5, Custom - ≥0.5, Custom FBG Recoating None, Acrylate, Polyimide, Aluminium, Copper, Custom None, Acrylate, Polyimide, Custom None, Low- or High-index Polymer, Acrylate, Polyimide, Custom None, Acrylate, Polyimide, Aluminium, Copper, Custom Tensile Strength [kpsi] >100 - >100 Optical Connector Bare Fiber, FC/APC, LC/APC, Custom - Bare Fiber, Custom Bare Fiber, FC/APC, LC/APC, Custom Package Dimensions LxWxH [mm] - - - - 25 x 10 x 6.0 - - Applications: In-fiber Mirrors; Narrowband Optical Filters; (Multipoint) Strain & Temperature Sensing; Signal and Brillouin Scatter Filtering; Gain-flattening EDFAs; ASE Light Sources; Band Stop Filters; Pulsed, Ultrafast Mode-locked & Single-frequency Fiber Lasers; Powerful Lasers; Chromatic Dispersion Compensation Telecom Systems; Other

Product number: SW11871

Manufacturer: FORC Photonics

Transmitting Volume Bragg Gratings

Wavelength 400-2700 nm; Bandwidth 0.05-100 nm; Diffraction Efficiency 5-99%; Thickness 0.50-10 mm; Aperture Up to 50x50 mm OptiGrate’s transmitting volume Bragg gratings (TBGs) are diffractive optical elements operating in transmitting geometry when a diffracted beam crosses the back surface of the grating. BragGrate™ Deflector is a transmitting volume Bragg grating recorded in a bulk of photosensitive silicate glass. The Deflector acts as a very narrow band mode selector in angular and spectral spaces and, therefore, enables spectrally selective beam steering and angular magnification. The spectral filtering is as narrow as 0.1 nm and can easily achieve deflection angles of up to 45°. The grating is embedded inside the glass material and is stable to light powers exceeding 1 kW, temperatures >+400°C, and is fully environmentally stable. BragGrate™ Combiner is a transmitting volume Bragg grating (or sets of gratings) that is used for spectral beam combining (SBC). This element enables combining of laser radiation from multiple sources into a single, nearly diffraction-limited beam with increased energy brightness. SBC by means of our BragGrate™ Combiner is a simple and robust technique for combining high-power laser radiation with a record spectral brightness. Excellent mechanical properties and a refractive index that is independent of temperature enables the combiners to withstand high-power laser radiation, thus making the components the ideal element for high-powered SBC. Key Features: High-powered Operations: >1 kW, Up to 10 kW High-energy Operations: Up to 5 J/cm² No Degradation Over Lifetime Superior Environmental Stability Very High Angular Selectivity No Polarization Dependence at Small Incident Angles Near-diffraction-limited Beam Quality Possible Multiplexing of Different Angular Selectors in One Volume Low Wavefront Aberrations Diffraction Efficiency (DE): 5% to 99%, 90% to 99% Standard Diffraction Efficiency: >97% Spectral Bandwidth: 0.5 nm to 100 nm; 0.05 nm to 20 nm Standard Spectral Bandwidth (FWHM): 10 nm Operating Wavelength Range: 400 nm to 2700 nm Standard Center Wavelengths: 532 nm, 1064 nm, 1550 nm Grating Thickness: 0.50 mm to 10 mm Apertures: Up to 50 × 50 mm² Angular Selectivity: 0.1 mrad to 100 mrad, 0.5 mrad to 10 mrad Total Deflection Angles: 5° to 45°, <120° Lateral Dimensions: 12.5 x 12.5 mm² to 35 x 35 mm² Applications: 3D Beam Steering; Angular Magnification in Fast Switches; Transmitting Spectral and Angular Selector; Beam Combining; Beam Shaping and Filtering; High-power Spectral Beam Combining

Product number: SW11877

Manufacturer: OptiGrate