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