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Proceedings Paper

Diode arrays for high-temperature operation in military environments (Conference Presentation)
Author(s): Jeremy Junghans; Ryan Feeler; Wade Collins

Paper Abstract

Many military applications require reliable laser diode operation across a wide range of elevated temperatures. Size, Weight and Power (SWaP) restrictions often limit cooling options and necessitate that high-power emission at the desired pump wavelength is maintained across wide temperature ranges. A family of QCW diode arrays has been developed for operation in these harsh environments. The arrays may be constructed with either multi-wavelength diode bars or wavelength locked with Volume Bragg Gratings (VBGs) to optimize absorption across a wide range of temperatures. The arrays have been designed to withstand the mechanical shock and vibration requirements common to military environments. This paper includes a comparison of the multi-wavelength arrays and VBG-locked arrays at high temperatures. Both sets of arrays were characterized across a broad temperature range and exposed to MIL-STD shock and vibration testing. VBG locked arrays are shown to provide >90% locking across a 15° operating range whereas multi-wavelength arrays allowed power absorption to be maintained across incredibly wide ranges (e.g. -40° to 70°C). Life test results from arrays operated at 80oC, 250A, 60Hz for over 600 million pulses are also presented. These arrays demonstrate excellent high-temperature reliability over a pulse count well in excess of the requirement of many military applications (e.g. range finders / target designators).

Paper Details

Date Published: 14 May 2018
Proc. SPIE 10637, Laser Technology for Defense and Security XIV, 106370E (14 May 2018); doi: 10.1117/12.2305070
Show Author Affiliations
Jeremy Junghans, Northrop Grumman Cutting Edge Optronics (United States)
Ryan Feeler, Northrop Grumman Cutting Edge Optronics (United States)
Wade Collins, Northrop Grumman Cutting Edge Optronics (United States)

Published in SPIE Proceedings Vol. 10637:
Laser Technology for Defense and Security XIV
Mark Dubinskiy; Timothy C. Newell, Editor(s)

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