VBG controlled narrow bandwidth diode laser arrays

Joseph Levy; Ryan Feeler; Jeremy Junghans

doi:10.1117/12.909276

8 February 2012 VBG controlled narrow bandwidth diode laser arrays

Joseph Levy, Ryan Feeler, Jeremy Junghans

Proceedings Volume 8241, High-Power Diode Laser Technology and Applications X; 82410M (2012) https://doi.org/10.1117/12.909276
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

Northrop Grumman Cutting Edge Optronics has developed large kilowatt class lensed laser diode arrays with subnanometer spectral width using Volume Bragg Grating (VBG) reflectors. Using these CW arrays with 100W bars at 885nm, excellent absorption in Nd:YAG is achieved, with lower thermal aberration than can be attained with 808nm pumps. The additional cost of the VBG reflectors and their alignment is partially offset by the much broader wavelength tolerance that is allowed in the unlocked array enhancing bar yield. Furthermore, the center wavelength of the arrays exhibit lower temperature sensitivity allowing the arrays to be operated over a wider current or temperature range than arrays without wavelength control. While there is an efficiency penalty associated with the addition of VBGs of 5-8%, it is more than compensated for by enhanced absorption, especially when used with narrowband absorption lines, such as 885nm in Nd:YAG. An overview of the design and manufacturing issues for arrays that are wavelength-locked with VBGs is presented along with the effect of post-construction hard UV exposure.

Citation Download Citation

Joseph Levy, Ryan Feeler, and Jeremy Junghans "VBG controlled narrow bandwidth diode laser arrays", Proc. SPIE 8241, High-Power Diode Laser Technology and Applications X, 82410M (8 February 2012); https://doi.org/10.1117/12.909276

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