Transmitting or reflecting volume Bragg gratings for spectral beam combining
BragGrate™ Combiner is a transmitting or reflecting volume Bragg grating (or set of gratings) enabling Spectral Beam Combining (SBC). It combines laser radiation from numerous sources into a single, nearly diffraction-limited beam with increased energy brightness. SBC by means of our BragGrate Combiners 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 them the ideal elements for high-powered SBC.
Specifications
- Diffraction Efficiency (DE): 90-99%
- Spectral Bandwidth: 50 pm to 20 nm
- Operating Range λ: 400-2700 nm
- Grating Thickness: 0.50-10 mm
- Apertures: up to 50×50 mm2
- Angular Selectivity: 0.5-10 mrad
- Deflection Angles: 5-45 deg
Standard Parameters
- Center Wavelength: 930-980, 1030-1100 nm
- Spectral Bandwidth (FWHM): 0.2-0.5 nm
- Diffraction Efficiency 95-99%
- Lateral Dimensions: 15×15, 20×20 mm2
Advantages & Features
- High power operations up to 10 kW
- High energy operations up to 5 J/cm2
- Unrestricted lifetime; no degradation of parameters has been detected for 10 years
- Very high angular selectivity (TBG)
- Very high spectral selectivity (RBG)
- Superior environmental stability
- No polarization dependence at small incident angles
- Nearly diffraction-limited beam quality
Applications
High power spectral beam combining Latest achievements: 5-beam combining with total output power of 780 W, combining efficiency of > 90%, channel spacing 0.25 nm.
Spectral beam combining scheme with 4 BragGrate™ Combiners
Spectrum of spectrally-combined output beam with a total power of 780 W and channel spacing of 0.5 nm