Low Refractive Index Optical Adhesives

Viscosity 70->20,000 mPas; Shear Bond Strength > 69->200 kgf/cm²; Bending Adhesion Strength 9-25 kgf/cm²; UV Curing Conditions 10-100 mW/cm², 5, 10 min; Colour Light Yellow, Colourless, White; Tg +42-+219 °C NTT-AT’s series of adhesives for fiber array assemblies feature high moisture resistance and excellent workability for v-groove fixing or optical fiber fixing. Fiber arrays are used for the input and output of optical waveguide devices. NTT-AT’s AT3925M, AT9390, AT9968, AT3727E and AT3728E epoxy-based optical adhesives are used for fixing the v-grooves and have realized price reductions while enhancing moisture resistance compared to conventional products. These adhesives can be polished after assembly. NTT-AT’s AT9575M (epoxy) and AT8105 (acrylate) adhesives for optical fiber fixing have gained popularity for their good workability as non-fluid adhesives. NTT-AT has executed durability tests that have shown no peeling of a fiber array after 2,000 hours at +85 °C and 85% of humidity. With viscosities that are appropriate for the usage location, the adhesives for fiber array assemblies are easy to use. While the adhesives for fixing v-grooves show fluidity, the optical fiber fixing adhesives’ consistency is that of a paste, suitable for protecting the fiber. In case you need any consulting regarding issues related to adhesion, please contact the AMS Technologies optical adhesives experts to discuss the detailed challenges of your application. Key Features: Excellent Durability Just the Right Viscosity for Easy Application: Non-liquid Viscosity for Fiber Fixation, Low Viscosity Fluid for Fiber Fixation into V-Type Groove Heat-proof: Maximum Glass Transition Temperature Tg of Over +200 °C (AT3925M) Viscosity: 70 to >20,000 mPas Shear Bond Strength: > 69 to >200 kgf/cm² Bending Adhesion Strength: 9 to 25 kgf/cm² UV Curing Conditions: 10 to 100 mW/cm², 5, 10 min Colour (Pre-Curing): Light Yellow, Colourless, White Glass Transition Temperature Tg: +42 to +219 °C Applications: Gluing of Fiber Array Assemblies; V-Groove Fixing; Optical Fiber Fixing

Refractive Index 1.458-1.567; Viscosity 145-2,000 mPas; Optical Transmittance (@1 mm, 1.3 µm) 82%-94%; Bond Strength 99->247 kgf/cm²; UV Curing Conditions 10, 30 mW/cm², 5, 10 min You are looking for PLC and fiber array adhesion with high reliability? Try NTT-AT’s series of adhesives for optical waveguides! Within this series you find acrylate-based adhesives (AT6001, AT8224)with excellent durability that have cleared a large number of reliability tests. Epoxy adhesives are also part of this series, with a refractive index that can be accurately controlled within a range of 1.456 to 1.567 (±0.005, Na-D) – or with a fixed refractive index that is the same as quartz to deliver low reflectance (GA700L, GA700H). UV curing of the adhesives for optical waveguides allows for adhesion in a short time frame and makes alignment easy. The adhesives withstand a solder reflow process for Si Photonics (+260 °C). In order to achieve high reliability, a product must clear the tests conducted by the users themselves. If you have had even just a bit of dissatisfaction in reliability test results in the past, please put NTT-AT’s adhesives for optical waveguides to the test. In case you need any consulting regarding issues related to adhesion, please contact the AMS Technologies optical adhesives experts to discuss the detailed challenges of your application. Key Features: Optical Adhesive Used for PLC to Fiber Link-up Precision Refraction Index of 1.458 to 1.567 (±0.005, Na-D) Provides Controllability Ultraviolet (UV) Curing Conditions: 10, 30 mW/cm², 5, 10 min Very Little Adhesion Loss Due to Heat or Moisture, Providing High Durability Viscosity: 145 to 2,000 mPas Optical Transmittance: 82% to 94% (@1 mm Thickness, Wavelength 1.3 µm) Bond Strength: 99 to >247 kgf/cm² Applications: Gluing of Optical Waveguides; PLC to Fiber Link-up; Silicon Waveguide to Fiber Link-up

Piranha EPO-TEK® 353ND Epoxy, 2 gramsTwo component, 100% solids, heat curing epoxy designed for high temperature applications. It will perform continuously at 200°C while also tolerating 300-400°C for several hours. Recommended cure time and temperature: 110°C for 30 minutes. Pot life of up to 3 hours.

Piranha EPO-TEK® 353ND Epoxy, 4 gramsTwo component, 100% solids, heat curing epoxy designed for high temperature applications. It will perform continuously at 200°C while also tolerating 300-400°C for several hours. Recommended cure time and temperature: 110°C for 30 minutes. Pot life of up to 3 hours.

Refractive Index 1.603-1.720; Viscosity 9-7,000 mPas; Transmittance 72%-96%; Hardness 67-83 Shore D; Shear Bond Strength 35->280 kgf/cm²; UV Curing Conditions 10, 100 mW/cm², 5, 10 min; Tg +63-+113 °C With a typical refractive index of 1.5 in conventional optical adhesives, the problem of a high reflection loss arose in cases of adhesion with high refractive index glass and crystal materials. Utilizing its refractive index control technology and optical loss reduction technology, NTT-AT has developed optical adhesives with a high refractive index adjustable to 1.6 or more. By adding high refractive index fillers, NTT-AT is even able to manufacture resins with a refractive index of 1.9. These resins are aimed at usage in the fields of optical recording, display technology, optical energy uses, etc. In addition to this series, NTT-AT also provides high refractive index resins for nanoimprint applications. NTT’s high refractive index resins are excellent in transparency in visible light domains, with haze values of 1 or less, so it is expected that they are used as a coating agent for displays and similar products. Within this series, you find acrylate-based adhesives (#18165 and #6205) as well as epoxy adhesives (E3754 and E7200). To match the particular working environment of our customers, NTT-AT provides both ultraviolet (UV) and heat curing types. NTT-AT provides refractive index customized resins to meet each customer's needs. It is possible to respond to several kinds of requests such as with/without solvent or adjusting the viscosity. Please contact the AMS Technologies optical adhesives experts to discuss your customized refractive index matched optical adhesive solution. Key Features: Refractive Index of 1.6 or More Can Be Chosen High Accuracy of Refracting Index Control: ±0.005 Choice of Either Ultraviolet (UV) Curing or Heat Curing Method High Transparency in Visible Light Domains: Optical Transmittance 90% or More at 1 mm Thickness Refractive Index: 1.603 to 1.720 Viscosity: 9 to 7,000 mPas Transmittance: 72% to 96% Hardness: 67 to 83 Shore D Shear Bond Strength: 35 to >280 kgf/cm² UV Curing Conditions: 10, 100 mW/cm², 5, 10 min Glass Transition Temperature Tg: +63 to +113 °C Applications: High Refractive Index Coating Agents; Bonding High Refractive Index Crystal Materials; Bonding High Refractive Index Glass (for Camera Lenses, Eyeglass Lenses, etc.); Higher Efficiency Optical Input and Output Power; Efficient Conversion of Light Energy; Optical Recording; Display Technology

Viscosity 36,000, 180,000 mPas; Bending Adhesion Strength >114, >128 kgf/cm²; UV Curing Conditions 100 mW/cm², 2 min; Curing Shrinkage Rate 0.5%, 0.9%; Tg +195, +233 °C; Thermal Expansion Coefficient 18, 20 ppm/°C NTT-AT’s high-precision optical adhesives allow easy fixation of optical components with sub-micron accuracy. Based on epoxy, these high-precision optical adhesives are available with low viscosity of 36,000 mPas (AT3916P) or with high viscosity of 180,000 mPas (AT3862P). Both adhesives show minimal position changes due to curing time and temperature. Shrinkage rate during curing is very low for this series of high-precision optical adhesives, and the thermal expansion coefficient is small. Using ultraviolet (UV) ray curing makes alignment easy. NTT-AT’s series of high-precision adhesives show excellent durability: Even after a high-temperature process at +260 °C, the adhesives’ bonding strength does not change. And no peeling occurred after 200 cycles in a simplified heat cycle test. In order to achieve high reliability, a product must clear the tests conducted by the users themselves. If you have had even just a bit of dissatisfaction in precision or durability results in the past, please put NTT-AT’s high-precision adhesives to the test. In case you need any consulting regarding issues related to adhesion, please contact the AMS Technologies optical adhesives experts to discuss the detailed challenges of your application. Key Features: Low Shrinkage Rate During Curing: 0.5% (AT3862P), 0.9% (AT3916P) Low Thermal Expansion Coefficient: <20 ppm/°C Ultraviolet (UV) Curing for Easy Alignment Excellent Durability: No Change in Bonding Strength After +260 °C High-temperature Process, No Peeling After 200 Heat Test Cycles Viscosity: 36,000, 180,000 mPas Bending Adhesion Strength: >114, >128 kgf/cm² UV Curing Conditions: 100 mW/cm², 2 min Glass Transition Temperature Tg: +195, +233 °C Applications: High-precision Fixation of Optical Components With Sub-micron Accuracy

Refractive Index 1.52; 100 cps Viscosity at 25°CNorland Index Matching Liquid 150 is a low viscosity liquid monomer that can be used as an index matching media for temporary splicing using the Norland Optical Splice. This material will not cure and will always remain a liquid. Typical Properties of Norland Index Matching Liquid 150 Appearance Light yellow liquid Normal index matching silicone fluids and gels can cause adhesion problems because once it contacts a surface it is very difficult to remove all traces. Our IML 150 can be removed with acetone.

Refractive Index 1.689-1.9; Viscosity 15, 138 mPas; Transmittance 94%-97%; UV Curing Conditions 100 mW/cm², 1, 5 min; Tg +100, +125 °C Nano imprint lithography is the next generation process technology. This simple and low-cost fabrication technology enables nano-scale patterns. NTT-AT’s high refractive index, UV-curable nano imprint lithography resins provide highly functional fine patterns with high accuracy. This series’ high refractive index (RI) helps to miniaturize optical components. Resin type #18210 features a refractive index of more than 1.7 and contains solvent, good for creating a thin film (<1 µm). Solvent-free resin type #18247 enables to produce thicker layers (>2 to 3 µm) and can create nano-size patterns without a pre-baking process to evaporate the solvent. This product maintains a high refractive index of 1.689 to 1.765, depending on the light’s wavelength, keeping a high transparency in the visible wavelength range by using non-organic fillers. With the recent increase in the refractive index of glass for AR/VR, aimed at expanding the field of view, the demand for resins to match this higher RI is also increasing. Just recently, NTT-AT has developed new 1.8 and 1.9 refractive index resins with high transparency and good nanoimprintability, able to fabricate a uniform thin film by spin coating. These resins are expected to contribute to the improvement of the flexibility in optical design. NTT-AT uses high-precision refractive index control technology in the manufacture of optical adhesives to increase the concentration of high-refractive-index inorganic nanofillers and achieve high refractive index while optimizing the resin formulation. These resins are compatible with high-refractive index glasses and can create nano-patterns with a line width of 50 nm to 10 µm by nanoimprinting. They feature high light transmission in the wavelength range from 400 nm to 800 nm. If you are looking for high refractive index resins for nano imprint lithography, please contact the AMS Technologies optical adhesives experts to find out more about our range of solutions. Key Features: High Accuracy High Refractive Index (RI): 1.689 to 1.9 Characteristics of Resin can be Customized Solvent-free Variant (#18247) Enables Omitting a Pre-baking Process as well as Dispensing and Pushing Mold and Substrate Together Solvent-free Variant (#18247): No Solvent Affecting the Substrate, Even Possible to Create a Bulk Film Without Substrate Solvent-free Variant (#18247) Not Categorized in Dangerous Goods, Thus Easy to Transport High Light Transmittance: 94% to 97% Viscosity: 15, 138 mPas Abbe’s Number: 24, 31 Haze: <0.1% Shrinkage: 6%, 7% UV Curing Conditions: 100 mW/cm², 1, 5 min Glass Transition Temperature Tg: +100, +125 °C Applications: High Refractive Index Nanoimprinting; Coating; Solvent-free Nanoimprinting

Refractive Index 1.51; 350 cps Viscosity at 25°C NBA 107 (10g syringe) is a single component, UV curing adhesive used for temporary bonding of lenses to metal polishing mounts or where bonded components need to be easily separated in the future. The adhesive cures in minutes at room temperature by exposure to long wave UV light and eliminates the heat induced strain typical of the old fashioned hot pitch blocking methods. NBA 107 is specifically formulated to provide low shrinkage and low strain to further minimize any potential strain on the lens during the blocking process. Debonding is readily accomplished by heating in hot water with a small amount of detergent or wetting agent added or with acetone.The adhesive cures only by exposure to UV light in the range of 350 to 380 nanometers. Recommended light sources include mercury lamps, sun lamps, fluorescent black lights and xenon lamps. Norland Products sells a variety of light sources optimized for curing our adhesive. The adhesive needs 5 joules per centimeter squared of long wave Uv energy to fully cure. Cure time will depend on the amount of UV energy the light source used generates at the surface of the adhesive. Typical Properties of NBA 107   Solids 100% Elongation at Failure 5% Modulus (psi) 800 Tensile (psi) 76 Hardness - Shore D 15   Shelf life of the liquid is at least 6 months at room temperature if stored in the original container away from UV light. Prolonged skin contact should be avoided and affected areas should be washed with soap and water. Avoid prolonged vapor inhalation and use in a well ventilated area.  

Refractive Index 1.51; 550 cps Viscosity at 25°C  NBA 108 (10g syringe) is a single component, UV curing adhesive used for temporary bonding of lenses to metal polishing mounts. This blocking adhesive is formulated to be used with polishing processes that use large amounts of liquid or use heavy grinding. The adhesive cures in minutes at room temperature by exposure to long wave UV light and eliminates the heat induced strain typical of the old fashioned hot pitch blocking methods. NBA 108 is specifically formulated to provide low shrinkage and low strain to further minimize any potential strain on the lens during the blocking process. Debonding is accomplished by soaking in acetone.The adhesive cures only by exposure to UV light in the range of 350 to 380 nanometers. Recommended light sources include mercury lamps, sun lamps, fluorescent black lights and xenon lamps. Norland Products sells a variety of light sources optimized for curing our adhesive. The adhesive needs 5 joules per centimeter squared of long wave UV energy to fully cure. Cure time will depend on the amount of UV energy the light source used generates at the surface of the adhesive. Solids 100% Elongation at Failure 18% Modulus (psi) 710 Tensile (psi) 101 Hardness - Shore D 25 Shelf life of the liquid is at least 6 months at room temperature if stored in the original container away from UV light. Prolonged skin contact should be avoided and affected areas should be washed with soap and water. Avoid prolonged vapor inhalation and use in a well ventilated area.

Refractive Index 1.315; 15 cps Viscosity at 25°C Norland Optical Adhesive 1315 is clear liquid adhesive that will cure when exposed long wavelength ultraviolet light. NOA 1315 is recommended for bonding for glass to glass. Adhesion is also good to cellulose acetate butyrate. NOA 1315 is cured by ultraviolet light between 320 to 450 nm. Full cure requires 6 Joules/cm 2. The adhesive exhibits oxygen inhibition when used exposed to air. To overcome this the adhesive must be cured under an inert atmosphere, such as nitrogen. When used as a coating the liquid adhesive's temperature must be kept below 9C to prevent vaporization.Typical Properties of NOA 1315 Temperature Range -15°C to 90°C Keep NOA 1315 in a cool ( 5 to 20°C) dark place. If refrigerated, allow the adhesive to come to room temperature before using.

Refractive Index 1.315; 15 cps Viscosity at 25°C Norland Optical Adhesive 1315 (2g syringe) is clear liquid adhesive that will cure when exposed long wavelength ultraviolet light. NOA 1315 is recommended for bonding for glass to glass. Adhesion is also good to cellulose acetate butyrate. NOA 1315 is cured by ultraviolet light between 320 to 450 nm. Full cure requires 6 Joules/cm 2. The adhesive exhibits oxygen inhibition when used exposed to air. To overcome this the adhesive must be cured under an inert atmosphere, such as nitrogen. When used as a coating the liquid adhesive's temperature must be kept below 9C to prevent vaporization.Typical Properties of NOA 1315 Temperature Range -15°C to 90°C   Keep NOA 1315 in a cool ( 5 to 20°C) dark place. If refrigerated, allow the adhesive to come to room temperature before using.