Room Temperature Single-Frequency Output at 2118 nm
from a Diode-Pumped Tm, Ho:YAP Laser¹

F. Chen*, L. X. Yu, X. L. Liu, B. Q. Yao, W. Wang, C. H. Zhang, and Y. L. Ju

National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, 150001 China

*e-mail: chenfej@163.com

Received August 31, 2011; in final form, Septmber 2, 2011; published online December 28, 2011

Abstract—A diode end-pumped single-frequency Tm, Ho:YAP laser at room temperature was reported. We
demonstrated a single-frequency Tm, Ho:YAP laser at 2118.09 nm wavelength with output power up to 57mW
using two Fabry–Perot intracavity etalons. The optical conversion efficiency is 2.0% and the slope efficiency is
12.7%. The measured full width at half maximum linewidth was <7.5 pm limited by the resolution of the scan-
ning Fabry–Perot etalon used to make the measurement. The wavelength was demonstrated to be stable to about
2 pm over 40 s time periods limited by the temperature stability of the laser. The single-longitudinal-mode
(SLM) laser can be used as a seed laser for coherent wind measurements and differential absorption LIDAR
systems.

DOI: 10.1134/S1054660X12020077

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