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Proceedings Paper

Narrow-band and low SWaP diodes in tough environments
Author(s): David Irwin; Dean Stapleton; Golchehr Noshirvani; Tina Guiney; Joseph Braker; Kim Alegria; Chris Ebert; Lukas Gruber
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Paper Abstract

High Power multi-kW class fiber lasers have become a leading technology in Directed Energy applications. With Direct Energy weapons and countermeasures moving closer to a deployable technology, industry players are now looking to ensure the components within their systems can withstand the harsh environments in which they will be used. With limited power available in the field, efficiency is a key criterion for these systems and there is a careful balance for diode laser pumps as a piece of the overall system. Increasing the cooling capacity delivered to the diode pumps will increase their Electrical-to-Optical efficiency, but requires more energy be consumed in the cooling loop through lowering the coolant temperature or increasing the pump speed to increase flow rate. In this paper, Coherent|DILAS aims to map these uncharted waters for its Low SWaP diode lasers by exploring trade space for the parameters that are critical to the overall system efficiency. By changing coolant types from water to glycol mixes, coolant freezing can be eliminated while the effects of coolant viscosity are explored. Additionally, direct changes to the coolant temperature and flow rates further explore cooling/efficiency trade space. Experiments are then repeated with an external grating to lock the center wavelength at the 976nm absorption band. The range at which locking is maintained and the efficiency change will be explored for various coolant, flow, and temperature configurations. With a large web of interacting processes being explored, Coherent|DILAS aims to enable further overall system optimization within Directed Energy community.

Paper Details

Date Published: 21 May 2018
PDF: 8 pages
Proc. SPIE 10637, Laser Technology for Defense and Security XIV, 1063709 (21 May 2018); doi: 10.1117/12.2304497
Show Author Affiliations
David Irwin, DILAS Diode Laser, Inc. (United States)
Dean Stapleton, DILAS Diode Laser, Inc. (United States)
Golchehr Noshirvani, DILAS Diode Laser, Inc. (United States)
Tina Guiney, DILAS Diode Laser, Inc. (United States)
Joseph Braker, DILAS Diode Laser, Inc. (United States)
Kim Alegria, DILAS Diode Laser, Inc. (United States)
Chris Ebert, Coherent, Inc. (United States)
Lukas Gruber, DILAS Diode Laser, Inc. (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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