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Proceedings Paper

Fiber laser pumped high energy cryogenically cooled Ho:YLF laser
Author(s): Espen Lippert; Helge Fonnum; Knut Stenersen
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Paper Abstract

In this paper we report on a high energy, low repetition rate 2-micron-laser, with high conversion efficiency in terms of output energy per pump power. The laser consists of a Ho3+-doped LiYF4 (YLF) crystal cooled to cryogenic temperatures in an unstable resonator, pumped by a thulium fiber laser. The cooling to 77 K makes Ho:YLF a quasi four level laser system, which greatly enhances the extraction efficiency. We achieved 356 mJ in Q-switched operation at 1 Hz PRF when pumping the laser with 58 W for 36 ms. The high beam quality from the fiber laser and the use of an unstable resonator with a graded reflectivity mirror (GRM) resulted in a high quality laser beam with a M2-value of 1.3.

Paper Details

Date Published: 14 November 2012
PDF: 6 pages
Proc. SPIE 8543, Technologies for Optical Countermeasures IX, 854308 (14 November 2012); doi: 10.1117/12.973716
Show Author Affiliations
Espen Lippert, Norwegian Defence Research Establishment (Norway)
Helge Fonnum, Norwegian Defence Research Establishment (Norway)
Knut Stenersen, Norwegian Defence Research Establishment (Norway)

Published in SPIE Proceedings Vol. 8543:
Technologies for Optical Countermeasures IX
David H. Titterton; Mark A. Richardson, Editor(s)

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