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Proceedings Paper

A power scaled diode cladding pumped 2.8 µm Er:ZBLAN fiber laser (Conference Presentation)

Paper Abstract

Recent progress in development of Mid–IR lasers at ~2.8 µm and ~3.5 µm based on commercial Er:ZBLAN fibers has enabled variety of environmental sensing, defense and medical applications. This development faces a few major challenges, among which are relatively low laser efficiency (stemming from the naturally high quantum defect of laser operation) and power scaling limitation due to output self-pulsing (perceived to be coming from presence of clustering or ion pairs in a highly doped fiber, which act as saturable absorbers).We report on a study of the power scaling of a 976 nm diode-pumped double-clad Er:ZBLAN fiber laser at the ~2.8 µm, 4I11/2-4I13/2 transition. The passively cooled 7% Er-doped fluoride fiber laser was shown to achieve slope efficiency over 25% and 50 W with respect to launched pump power in both CW and Quasi-CW regimes of free-running operation. Laser power scaling was found to be limited by available 976 nm diode pump power.

Paper Details

Date Published: 14 May 2019
Proc. SPIE 10981, Laser Technology for Defense and Security XV, 1098107 (14 May 2019); doi: 10.1117/12.2522816
Show Author Affiliations
G. Alex Newburgh, U.S. Army Research Lab. (United States)
Mark Dubinskii, U.S. Army Research Lab. (United States)
Jun Zhang, U.S. Army Research Lab. (United States)
Wei Lu, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 10981:
Laser Technology for Defense and Security XV
Mark Dubinskiy; Timothy C. Newell, Editor(s)

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