Conductively cooled high-power high-brightness bars and fiber-coupled arrays

Hailong Zhou; Mark Mondry; Michael Fouksman; Eli Weiss; Serguei Anikitchev; Keith Kennedy; Jun Li; Erik Zucker; Paul Rudy; Jukka Kongas; Jouko Haapamaa; Sami Lehkonen

doi:10.1117/12.589860

17 March 2005 Conductively cooled high-power high-brightness bars and fiber-coupled arrays

Hailong Zhou, Mark Mondry, Michael Fouksman, Eli Weiss, Serguei Anikitchev, Keith Kennedy, Jun Li, Erik Zucker, Paul Rudy, Jukka Kongas, Jouko Haapamaa, Sami Lehkonen

Author Affiliations +

Proceedings Volume 5711, High-Power Diode Laser Technology and Applications III; (2005) https://doi.org/10.1117/12.589860
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

Abstract

Solid-state-laser and fiber laser pumping, reprographics, medical and materials processing applications require high power, high-brightness bars and fiber-coupled arrays. Conductively cooled laser diode bars allow customers to simplify system design and reduce operational size, weight, and costs. We present results on next generation high brightness, high reliability bars and fiber-coupled arrays at 790-830 nm, 940 nm and 980 nm wavelengths. By using novel epitaxial structures, we have demonstrated highly reliable 808 nm, 30% fill-factor conductively cooled bars operating at 60W CW mode, corresponding to a linear power density (LPD) of 20 mW/μm. At 25°C, the bars have shown greater than 50% wall-plug-efficiency (WPE) when operating at 60W. Our novel approach has also reduced the fast-axis divergence FWHM from 31° to less than 24°. These bars have a 50% brightness improvement compared to our standard products with this geometry. At 980nm, we have demonstrated greater than 100W CW from 20% fill-factor conductively cooled bars, corresponding to a LPD of 50 mW/µm. At 25°C, the WPE for 976nm bars consistently peaks above 65% and remains greater than 60% at 100W. We coupled the beam output from those high-brightness bars into fiber-array-packages (“FAPs”), and we also achieved high-brightness and high-efficiency FAPs. We demonstrated 60W from a 600µm core-diameter fiber-bundle with a high WPE of 55%, and a low numerical aperture of 0.115. The brightness of such FAPs is four times higher than our standard high-power 40W FAP products at Coherent. Ongoing life test data suggests an extrapolated lifetime greater than 10,000 hours at 80W CW operating-condition based on 30%FF conductively cooled bar geometry.

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Hailong Zhou, Mark Mondry, Michael Fouksman, Eli Weiss, Serguei Anikitchev, Keith Kennedy, Jun Li, Erik Zucker, Paul Rudy, Jukka Kongas, Jouko Haapamaa, and Sami Lehkonen "Conductively cooled high-power high-brightness bars and fiber-coupled arrays", Proc. SPIE 5711, High-Power Diode Laser Technology and Applications III, (17 March 2005); https://doi.org/10.1117/12.589860

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