Microchannel coolers for high-power laser diodes in copper technology

Volker K. Krause; Hans-Georg Treusch; Peter Loosen; T. Kimpel; Jens Biesenbach; Arnd Koesters; F. Robert; H. Oestreicher; Marcel Marchiano; Bernhard DeOdorico

doi:10.1117/12.176631

1 June 1994 Microchannel coolers for high-power laser diodes in copper technology

Volker K. Krause, Hans-Georg Treusch, Peter Loosen, T. Kimpel, Jens Biesenbach, Arnd Koesters, F. Robert, H. Oestreicher, Marcel Marchiano, Bernhard DeOdorico

Author Affiliations +

Proceedings Volume 2148, Laser Diode Technology and Applications VI; (1994) https://doi.org/10.1117/12.176631
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

This paper describes as an alternative to the silicon technology the production, assembly, and performance of microchannel coolers in copper technology. A realization technique for these copper coolers is described for one specific cooler geometry with a stacked design of 5 microstructured copper plates. These 5 layers are bonded together by diffusion welding at a temperature near 800 degree(s)C. This bonding process allows the fabrication of 3 X 8 coolers in one step in which the 5 structured copper plates of a size of 100 X 150 mm² are bonded together. The structuring procedure is currently done by etching and laser machining. Microchannels with a width of 60 - 100 micrometers and a depth of 300 micrometers are used in the experiments as microstructures for better comparability to already existing theoretical and experimental results. A thermal resistance of 0.44 K/W of these copper coolers is demonstrated for a device with a 10 mm laser diode bar mounted on the front edge of the cooler. Experimental results for this configuration reach an average laser diode power of 71.5 Watts from one single bar with a footprint of 0.6 X 10 mm². The experimental results are compared to 3-D heat flow calculations.

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Volker K. Krause, Hans-Georg Treusch, Peter Loosen, T. Kimpel, Jens Biesenbach, Arnd Koesters, F. Robert, H. Oestreicher, Marcel Marchiano, and Bernhard DeOdorico "Microchannel coolers for high-power laser diodes in copper technology", Proc. SPIE 2148, Laser Diode Technology and Applications VI, (1 June 1994); https://doi.org/10.1117/12.176631

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