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Proceedings Paper

High-pulse-energy 3.9-µm lasers in Ho:BYF
Author(s): Russell Stutz; Harold C. Miller; Kenneth M. Dinndorf; Arlete Cassanho; Hans P. Jenssen
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Paper Abstract

Experimental results describing pulsed lasers operating near 3.9 μm on the Ho3+ (5I5-5I6) transition in highly-doped (> 10 at. %) barium yttrium fluoride (BaY2F8 or BYF) will be presented. The 5I5 manifolds in Ho:BYF were pumped using a flashlamp excited, free-running Cr:LiSAF laser tuned to the Ho3+ absorption peak near 889nm. Ho3+ concentrations of 10%, 20%, 30% and 40% in BYF were lased in a simple end-pumped resonator. Some similar data was also obtained in 10% and 20% Ho:YLF. The highest 3.9 μm pulse energy obtained in the comparative study was 55 mJ (at ~10% optical-to-optical efficiency) using the 30% Ho:BYF crystal. A dual end-pumped laser in 30% Ho:BYF was also demonstrated, providing a pulse energy of 90 mJ in a near diffraction limited beam (M2 ~ 1.2). Emission decay data was taken to shed light on the observed dependence of laser efficiency on holmium concentration and excitation density. The lifetimes of both lasing levels (5I5 and 5I6) deviate rather significantly from their low-concentration values. Plausible energy transfer processes that may be responsible for the observed trends in the laser and emission data will also be discussed.

Paper Details

Date Published: 8 July 2004
PDF: 9 pages
Proc. SPIE 5332, Solid State Lasers XIII: Technology and Devices, (8 July 2004); doi: 10.1117/12.538417
Show Author Affiliations
Russell Stutz, Air Force Research Lab. (United States)
Harold C. Miller, Air Force Research Lab. (United States)
Kenneth M. Dinndorf, Air Force Research Lab. (United States)
Arlete Cassanho, AC Materials, Inc. (United States)
Hans P. Jenssen, College of Optics and Photonics/Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 5332:
Solid State Lasers XIII: Technology and Devices
Richard Scheps; Hanna J. Hoffman, Editor(s)

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