Narrow Pulse Width and High Power Passively Q-Switched
Nd³⁺:Gd₃Ga₅O₁₂ Laser with Cr⁴⁺:YAG Saturable Absorber¹

J. P. Shen^a, * and C. F. Ding^b

^a Institute of Laser, School of Science, Beijing Jiaotong University, Beijing, 100044 China

^b Henan Key Laboratory of Laser and Opto-Electric Information Technology, Zhengzhou University,
Zhengzhou, 450052 China

*e-mail:09118378@bjtu.edu.cn, shen1984at007@163.com

Received February 14, 2012; in final form, June 24, 2012; published online October 1, 2012

Abstract—A compact, diode-pumped passively Q-switched Nd³⁺:Gd₃Ga₅O₁₂ (Nd:GGG) laser with Cr⁴⁺:YAG
saturable absorber has been successfully demonstrated. Stable Q-switched pulses with pulse energy of 100 J
and high peak power of 14 kW have been obtained. The pulse width was as short as 7 ns with low repetition
rate of 10 kHz. The dependence of pulse width, pulse repetition rate, pulse energy and pulse peak power on
pump power have been measured respectively. Experimental results reveal that the Nd:GGG crystal with
Cr⁴⁺:YAG saturable absorber is suitable for narrow pulse width and high power passively Q-switched lasers.

DOI: 10.1134/S1054660X12110126

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