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