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Proceedings Paper

Efficient 2-µm Tm:YAP Q-switched and CW lasers
Author(s): A. D. Hays; Brian Cole; Vernon King; Lew Goldberg
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Paper Abstract

Highly efficient, diode pumped Tm:YAP lasers generating emission in the 1.85-1.94 μm range are demonstrated and characterized. Laser optical efficiencies of 51% and 45%, and electrical efficiencies of 31% and 25% are achieved under CW and Q-switched operation, respectively. Laser performance was characterized for maximum average powers up to 20W with various cavity configurations, all using an intra-cavity lens to compensate for thermal lensing in the Tm:YAP crystal. Q-switched lasers incorportating a Cr:ZnS saturable absorber (SA), resonant mechanical mirror scanner, or acousto-optic modulator were characterized. To enable higher average output powers, measurements of the thermal lens were conducted for the Tm:YAP crystal as a function of pump power and were compared to values predicted by a finiteelement- analysis (FEA) thermal-optical model of the Tm:YAP crystal. A resonator model is developed to incorporate this calculated thermal lens and its effect on laser performance. This paper will address approaches for improving the performance of Tm:YAP lasers, and means for achieving increased average output powers while maintaining high optical efficiency for both SA and mechanical Q-switching.

Paper Details

Date Published: 15 February 2018
PDF: 5 pages
Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 1051102 (15 February 2018); doi: 10.1117/12.2289996
Show Author Affiliations
A. D. Hays, U.S. Army RDECOM CERDEC NVESD (United States)
Brian Cole, U.S. Army RDECOM CERDEC NVESD (United States)
Vernon King, U.S. Army RDECOM CERDEC NVESD (United States)
Lew Goldberg, U.S. Army RDECOM CERDEC NVESD (United States)

Published in SPIE Proceedings Vol. 10511:
Solid State Lasers XXVII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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