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Novel types of volume Bragg gratings with enhanced parameters were recorded in PTR glass. They were used for efficient spectral beam combination of high power multimode semiconductor lasers with high spectral density of 1 nm/channel.
While semiconductor lasers are the most efficient high power sources of optical radiation, their wide and unstable emission spectra and high divergence of radiation impede their utilization in a number of important industrial, medical, military, and scientific applications. One of the widely studied approaches to improve brightness of semiconductor lasers is the use of external resonators that provide...
Realizing high power high radiance sources for defense and industrial applications at the 100 kW level will likely require beam combining techniques due to fundamental thermal and non-linear limitations on the average power of a single diffraction-limited laser. Spectral beam combining (SBC) techniques can be used to sum the power of individual lasers to produce a diffraction-limited output beam with...
Incoherent combining of multiple laser beams with offset wavelengths into a single near-diffraction-limited beam is an effective solution to increasing energy brightness and scaling output power of high-power lasers. Volume Bragg gratings (VBGs) recorded in photo-thermo-refractive (PTR) glass allow spectral beam combining with a remarkably high spectral density of channels. Spectral beam combining...
Laser system power can be increased using volume Bragg gratings in PTR glass to combine multiple beams into a near-diffraction-limited beam. We present results of combining five fiber lasers and show achievability of multi-kW-level systems.
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