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Proceedings Paper

Er/Yb glass Q-switched lasers with optimized performance
Author(s): Lew Goldberg; Nate Hough; John Nettleton; Alan Hays; Stephen Chinn
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Paper Abstract

We characterize several configurations of compact, Q-switched, 1.5 um lasers based on Er/Yb doped glass. Such lasers are required for eye-safe laser range-finders (LRF), laser markers, and illuminators for 3D and gated imaging. While 1-3 Hz pulse repetition frequency (PRF) is adequate for LRFs, the other applications require much higher PRFs to achieve near-real-time image refresh rates. Lasers described here utilize Er/Yb glass active elements, side-pumped by a 940 nm laser diode bar, or end-pumped by a fiber-coupled laser diode, and made use of active or passive Q-switching (PQS) techniques. Active Qswitching is implemented with resonant scanning mirror, and PQS utilizes Co:Spinel saturable absorbers. Q-switched pulse energies of 5mJ and 3mJ are achieved with side-pumping and end-pumping, respectively. An optical efficiency of over 3.7%, the highest to our knowledge for a PQS Er/Yb glass laser, is measured for the end-pumped implementation. When configured to generate 1mJ, the endpumped PQS laser operates over a 2-25 Hz PRF range, with nearly constant pulse energy and optical efficiency. Features and advantages of the various laser configurations are compared.

Paper Details

Date Published: 7 March 2019
PDF: 8 pages
Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 1089603 (7 March 2019); doi: 10.1117/12.2510346
Show Author Affiliations
Lew Goldberg, U.S. Army RDECOM CERDEC NVESD (United States)
Nate Hough, U.S. Army RDECOM CERDEC NVESD (United States)
John Nettleton, U.S. Army RDECOM CERDEC NVESD (United States)
Alan Hays, U.S. Army RDECOM CERDEC NVESD (United States)
Stephen Chinn, Fibertek, Inc. (United States)

Published in SPIE Proceedings Vol. 10896:
Solid State Lasers XXVIII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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