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15 June 2023 High efficiency low SWaP 793-nm diode lasers for pumping Tm fiber amplifiers
Manoj Kanskar, Zhigang Chen, Thomas Prunty, Eric Martin, Ling Bao, Mark DeFranza, Mohammad Hokmabadi, Nick Biekert, Shiguo Zhang
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Proceedings Volume PC12515, Laser Technology for Defense and Security XVIII; PC1251502 (2023) https://doi.org/10.1117/12.2665921
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States
Abstract
Tm-doped fiber amplifiers are good sources for high energy laser, DIRCM, LIDAR, remote sensing and spectroscopy. The reported Tm-doped amplifiers have efficiencies between 55% to 65%. The diode lasers that are commercially available at 793 nm produce about 35% ex-fiber efficiency. Therefore, the power conversion efficiency of Tm-doped amplifiers is only in the range of 20% - 23% which is less than half that of Yb-doped amplifiers. One straightforward way to improve the e-o power conversion efficiency of Tm-doped fiber amplifiers is to boost the efficiency of 793 nm diode pump from 35% to >55%. This will enable >36% efficient Tm-doped fiber amplifiers. With improvement in epitaxial design, we have demonstrated 64% at 15.5 W producing fiber-coupled package with 400 W in 225-μm/0.22 NA and 54% ex-fiber efficiency in packages with <0.63 kg/kW and <0.49 cc/W specific mass and specific volume, respectively. Further improvement is underway and we will update the latest results.
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Manoj Kanskar, Zhigang Chen, Thomas Prunty, Eric Martin, Ling Bao, Mark DeFranza, Mohammad Hokmabadi, Nick Biekert, and Shiguo Zhang "High efficiency low SWaP 793-nm diode lasers for pumping Tm fiber amplifiers", Proc. SPIE PC12515, Laser Technology for Defense and Security XVIII, PC1251502 (15 June 2023); https://doi.org/10.1117/12.2665921
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KEYWORDS
Fiber amplifiers
Semiconductor lasers
Thulium
Diodes
Directed infrared countermeasures
Fiber lasers
Optical amplifiers
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