Diode-Pumped Q-Switched Tm:LuAG Ring Laser
Operation at Room Temperature¹

F. Chen^a, *, C. T. Wu^b, Y. L. Ju^a, B. Q. Yao^a, and Y. Z. Wang^a

^aNational Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology,
Harbin, 150001 China

^bSchool of Science, Changchun University of Science and Technology,
Changchun, 130022 China

*e-mail: chenfej@163.com

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

Abstract—2-m lasers with high pulse energy and long pulse width of hundreds of nanoseconds are needed
urgently in the accurate wind velocity lidar systems. This paper presented the acoustic-optical Q-switched
Tm:LuAG laser performance in a pulsed-laser-diode end-pumping figure-eight ring resonator structure. Pulse
energy and pulse width are investigated with the increasing of the incident pump energy at different repetition
rate operation. Maximum energy of 3.3 mJ with the pulse width of 199 ns and 1.8 mJ with pulse width of 293
ns are obtained at the repetition rate of 20 and 50 Hz, respectively. Under Q-switched operation, the peak output
wavelength is 2.022 m at all time, and the beam quality factors are lower than 2 times diffraction-limited mea-
sured by a knife-edge traveling method.

DOI: 10.1134/S1054660X12020053

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