Volume Bragg Grating temperature gradient effect on laser diode array and stack spectra narrowing

Hongyan Wang; Zining Yang; Weihong Hua; Wenguang Liu; Xiaojun Xu

doi:10.1117/12.2010488

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30 January 2013 Volume Bragg Grating temperature gradient effect on laser diode array and stack spectra narrowing

Hongyan Wang, Zining Yang, Weihong Hua, Wenguang Liu, Xiaojun Xu

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Proceedings Volume 8677, XIX International Symposium on High-Power Laser Systems and Applications 2012; 86771F (2013) https://doi.org/10.1117/12.2010488
Event: XIX International Symposium on High-Power Laser Systems and Applications, 2012, Istanbul, Turkey

Abstract

A strip Volume Bragg Grating (VBG) locked 64 emitter diode laser array’s center wavelength shift of each emitter according to VBG’s local temperature is experimentally studied, which is consistent well with thermal imaging temperature distribution, Finite element analysis (FEA) is then used to study strip and large area VBG’s temperature gradients, we find even with minute heat deposition, due to PTR glass’s low heat conductivity, tens degrees temperature gradient could easily be built, we suggest it may be partially respond for stack’s poor spectra narrowing performance compared to single laser diode and diode array. Finally, some measures are further suggested to alleviate the effect.

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Hongyan Wang, Zining Yang, Weihong Hua, Wenguang Liu, and Xiaojun Xu "Volume Bragg Grating temperature gradient effect on laser diode array and stack spectra narrowing", Proc. SPIE 8677, XIX International Symposium on High-Power Laser Systems and Applications 2012, 86771F (30 January 2013); https://doi.org/10.1117/12.2010488

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