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Proceedings Paper

VBG controlled narrow bandwidth diode laser arrays
Author(s): Joseph Levy; Ryan Feeler; Jeremy Junghans
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Paper 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.

Paper Details

Date Published: 8 February 2012
PDF: 7 pages
Proc. SPIE 8241, High-Power Diode Laser Technology and Applications X, 82410M (8 February 2012); doi: 10.1117/12.909276
Show Author Affiliations
Joseph Levy, Northrop Grumman Cutting Edge Optronics (United States)
Ryan Feeler, Northrop Grumman Cutting Edge Optronics (United States)
Jeremy Junghans, Northrop Grumman Cutting Edge Optronics (United States)

Published in SPIE Proceedings Vol. 8241:
High-Power Diode Laser Technology and Applications X
Mark S. Zediker, Editor(s)

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