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Proceedings Paper

Custom ceramic microchannel-cooled array for high-power fiber-coupled application
Author(s): Jeremy Junghans; Ryan Feeler; Ed Stephens
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Paper Abstract

A low-SWaP (Size, Weight and Power) diode array has been developed for a high-power fiber-coupled application. High efficiency (~65%) diodes enable high optical powers while minimizing thermal losses. A large amount of waste heat is still generated and must be extracted. Custom ceramic microchannel-coolers (MCCs) are used to dissipate the waste heat. The custom ceramic MCC was designed to accommodate long cavity length diodes and micro-lenses. The coolers provide similar thermal performance as copper MCCs however they are not susceptible to erosion and can be cooled with standard filtered water.

The custom ceramic micro-channel cooled array was designed to be a form/fit replacement for an existing copperbased solution. Each array consisted of three-vertically stacked MCCs with 4 mm CL, 976 nm diodes and beamshaping micro-optics. The erosion and corrosion resistance of ceramic array is intended to mitigate the risk of copperbased MCC corrosion failures. Elimination of the water delivery requirements (pH, resistivity and dissolved oxygen control) further reduces the system SWaP while maintaining reliability.

The arrays were fabricated and fully characterized. This work discusses the advantages of the ceramic MCC technology and describes the design parameters that were tailored for the fiber-coupled application. Additional configuration options (form/fit, micro-lensing, alternate coolants, etc.) and on-going design improvements are also discussed.

Paper Details

Date Published: 6 March 2018
PDF: 7 pages
Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 1051411 (6 March 2018); doi: 10.1117/12.2291011
Show Author Affiliations
Jeremy Junghans, Northrop Grumman Cutting Edge Optronics (United States)
Ryan Feeler, Northrop Grumman Cutting Edge Optronics (United States)
Ed Stephens, Northrop Grumman Cutting Edge Optronics (United States)

Published in SPIE Proceedings Vol. 10514:
High-Power Diode Laser Technology XVI
Mark S. Zediker, Editor(s)

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