Forced air cooling of volume Bragg gratings for spectral beam combination

Brian Anderson; Sergiy Kaim; George Venus; Julien Lumeau; Vadim Smirnov; Boris Zeldovich; Leonid Glebov

doi:10.1117/12.2005951

22 March 2013 Forced air cooling of volume Bragg gratings for spectral beam combination

Brian Anderson, Sergiy Kaim, George Venus, Julien Lumeau, Vadim Smirnov, Boris Zeldovich, Leonid Glebov

Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 86013D (2013) https://doi.org/10.1117/12.2005951
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.2005951

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