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22 March 2013 Forced air cooling of volume Bragg gratings for spectral beam combination
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Volume Bragg gratings have been successfully used in spectral beam combining of high power fiber lasers with narrow channel separation and in four channel passive coherent beam combining of fiber lasers. Future application of beam combining with kilowatt level lasers requires a more detailed understanding of how to cool the gratings without hurting beam quality. Forced air cooling blown across both surfaces of the grating is both easy and cheap, but has been avoided in the past due to concerns of how the air density fluctuations will hurt beam quality. It is now shown that forced air cooling has no adverse effect on the M2 parameter due to density fluctuations in the air, and can efficiently cool VBG’s such that no degradation in beam quality is seen due to thermal distortions.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brian Anderson, Sergiy Kaim, George Venus, Julien Lumeau, Vadim Smirnov, Boris Zeldovich, and Leonid Glebov "Forced air cooling of volume Bragg gratings for spectral beam combination", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86013D (22 March 2013);

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