A High Efficiency Ho:YAlO₃ Laser Pumped by Tm:YLF Laser
with a Volume Bragg Grating¹

C. Yao, X. T. Yang*, and W. H. Li

College of Power and Energy Engineering, Institue of Marin Engine Electionic Control Technology)

Harbin Engineering University Harbin, 150001 China

*e-mail: yangxiaotao1985@163.com

Received September 29, 2011; in final form, October 1, 2011; published online February 6, 2012

Abstract—We report a CW Ho:YAlO₃ (Ho:YAP) laser at room temperature pumped by a Tm:YLF laser with
a Volume Bragg Grating (VBG) instead of the conventional mirror. The Ho:YAP laser operated at 2117.9 nm
with output power 9.12 W. The optical-to-optical conversion efficiency is 60.4% and slope efficiency is 71.2%.
The Ho:YAP output wavelength is centered at 2117.9 nm with bandwidth of about 1 nm. The beam quality fac-
tor is M² ~ 1.29 measured by the traveling knife-edge method.

DOI: 10.1134/S1054660X12030267

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