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Proceedings Paper

Efficient holmium-doped solid state lasers pumped by a Tm-doped silica fiber laser
Author(s): Deyuan Shen; Jayanta K. Sahu; W. Andrew Clarkson
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Paper Abstract

We report on efficient operation of Ho:YAG and Ho:YLF lasers in-band pumped by a tunable Tm-doped silica fiber laser. The Tm-doped fiber laser could be tuned over 150 nm from ~ 1860 to 2010 nm with a relatively narrow linewidth (<0.5 nm) at output power levels in excess of 9 W with a high power stability (RMS < 1.5%). Using a simple standing-wave cavity configuration, >6.4 W of TEMoo output was obtained from a Ho:YAG laser at 2.1 μm at the maximum incident pump power of 9.6 W at 1907nm from the Tm fiber laser, corresponding to an optical-to-optical efficiency of 67%, and the slope efficiency with respect to incident pump power was 80%. For a similar resonator design, 4.8 W of output at 2.07 μm was generated from a Ho:YLF laser at an incident pump power of 9.4 W, corresponding to an optical conversion efficiency of 51%. The different levels of performance of the Ho:YAG and Ho:YLF are compared and their relative merits discussed. Using a simple ring resonator geometry and an acousto-optic modulator to enforce unidirectional operation, we have obtained 3.7 W of single-longitudinal-mode output from a Ho:YAG laser. The prospects for further improvement in performance and higher output power are discussed.

Paper Details

Date Published: 23 December 2004
PDF: 10 pages
Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, (23 December 2004); doi: 10.1117/12.578515
Show Author Affiliations
Deyuan Shen, Univ. of Southhampton (United Kingdom)
Jayanta K. Sahu, Univ. of Southhampton (United Kingdom)
W. Andrew Clarkson, Univ. of Southhampton (United Kingdom)

Published in SPIE Proceedings Vol. 5620:
Solid State Laser Technologies and Femtosecond Phenomena
Jonathan A. C. Terry; W. Andrew Clarkson, Editor(s)

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