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Proceedings Paper

High-temperature diode laser pumps for directed energy fiber lasers (Conference Presentation)
Author(s): Manoj Kanskar; Ling Bao; Zhigang Chen; Mark DeVito; Weimin Dong; Mike P. Grimshaw; Xinguo Guan; David M. Hemenway; Robert Martinsen; Jim Zhang; Shiguo Zhang

Paper Abstract

Kilowatt-class fiber lasers and amplifiers are becoming increasingly important building blocks for power-scaling laser systems in various different architectures for directed energy applications. Currently, state-of-the-art Yb-doped fiber lasers operating near 1060 nm operate with optical-to-optical power-conversion efficiency of about 66%. State-of-the-art fiber-coupled pump diodes near 975 nm operate with about 50% electrical-to-fiber-coupled optical power conversion efficiency at 25C heatsink temperature. Therefore, the total system electrical-to-optical power conversion efficiency is about 33%. As a result, a 50-kW fiber laser will generate 75 kW of heat at the pump module and 25 kW at the fiber laser module with a total waste heat of 100 kW. It is evident that three times as much waste heat is generated at the pump module. While improving the efficiency of the diodes primarily reduces the input power requirement, increasing the operating temperature primarily reduces the size and weight for thermal management systems. We will discuss improvement in diode laser design, thermal resistance of the package as well as improvement in fiber-coupled optical-to-optical efficiency to achieve high efficiency at higher operating temperature. All of these factors have a far-reaching implication in terms of significantly improving the overall SWAP requirements thus enabling DEW-class fiber lasers on airborne and other platforms.

Paper Details

Date Published: 7 June 2017
PDF: 1 pages
Proc. SPIE 10192, Laser Technology for Defense and Security XIII, 101920F (7 June 2017); doi: 10.1117/12.2263699
Show Author Affiliations
Manoj Kanskar, nLIGHT Corp. (United States)
Ling Bao, nLIGHT Corp. (United States)
Zhigang Chen, nLIGHT Corp. (United States)
Mark DeVito, nLIGHT Corp. (United States)
Weimin Dong, nLIGHT Corp. (United States)
Mike P. Grimshaw, nLIGHT Corp. (United States)
Xinguo Guan, nLIGHT Corp. (United States)
David M. Hemenway, nLIGHT Corp. (United States)
Robert Martinsen, nLIGHT Corp. (United States)
Jim Zhang, nLIGHT Corp. (United States)
Shiguo Zhang, nLIGHT Corp. (United States)


Published in SPIE Proceedings Vol. 10192:
Laser Technology for Defense and Security XIII
Mark Dubinskii; Stephen G. Post, Editor(s)

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