Continuous improvement of high-efficiency high-power 800-980nm diode lasers at Spectra-Physics

Hanxuan Li; Terry Towe; Irving Chyr; Xu Jin; Robert Miller; Oscar Romero; Daming Liu; Denny Brown; Tom Truchan; Touyen Nguyen; Trevor Crum; Ed Wolak; Robert Bullock; Jeff Mott; James Harrison

doi:10.1117/12.809694

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23 February 2009 Continuous improvement of high-efficiency high-power 800-980nm diode lasers at Spectra-Physics

Hanxuan Li, Terry Towe, Irving Chyr, Xu Jin, Robert Miller, Oscar Romero, Daming Liu, Denny Brown, Tom Truchan, Touyen Nguyen, Trevor Crum, Ed Wolak, Robert Bullock, Jeff Mott, James Harrison

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Proceedings Volume 7198, High-Power Diode Laser Technology and Applications VII; 719805 (2009) https://doi.org/10.1117/12.809694
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

New-generation multi-mode 9xx mini-bars used in fiber pump modules have been developed. The epitaxial designs have been improved for lower fast-axis and slow-axis divergence, higher slope efficiency and PCE by optimizing layer structures as well as minimizing internal loss. For 915nm mini-bars with 5-mm cavity length, maximum PCE is as high as ~61% for 35W operation and remains above 59% at 45W. For 808nm, a PCE of 56% at 135W CW operation has been demonstrated with 36%-fill-factor, 3-mm-cavity-length, water-cooled bars at 50°C coolant temperature. On passive-cooled standard CS heatsinks, PCE of >51% is measured for 100W operation at 50°C heatsink temperature. Leveraging these improvements has enabled low-cost bars for high-power, high-temperature applications.

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Hanxuan Li, Terry Towe, Irving Chyr, Xu Jin, Robert Miller, Oscar Romero, Daming Liu, Denny Brown, Tom Truchan, Touyen Nguyen, Trevor Crum, Ed Wolak, Robert Bullock, Jeff Mott, and James Harrison "Continuous improvement of high-efficiency high-power 800-980nm diode lasers at Spectra-Physics", Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 719805 (23 February 2009); https://doi.org/10.1117/12.809694

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