Continuous Improvement of High-Efficiency, High-Power 800-980nm Diode Lasers at Spectra-Physics

摘要

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℃ coolant temperature. On passive-cooled standard CS heatsinks, PCE of >51 % is measured for 100W operation at 50℃ heatsink temperature. Leveraging these improvements has enabled low-cost bars for high-power, high-temperature applications.