Efficient holmium-doped solid state lasers pumped by a Tm-doped silica fiber laser

Deyuan Shen; Jayanta K. Sahu; W. Andrew Clarkson

doi:10.1117/12.578515

23 December 2004 Efficient holmium-doped solid state lasers pumped by a Tm-doped silica fiber laser

Deyuan Shen, Jayanta K. Sahu, W. Andrew Clarkson

Proceedings Volume 5620, Solid State Laser Technologies and Femtosecond Phenomena; (2004) https://doi.org/10.1117/12.578515
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

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 TEM_oo 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.

Citation Download Citation

Deyuan Shen, Jayanta K. Sahu, and W. Andrew Clarkson "Efficient holmium-doped solid state lasers pumped by a Tm-doped silica fiber laser", Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, (23 December 2004); https://doi.org/10.1117/12.578515

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