Experimental and theoretical study of passively Q-switched Yb:YAG laser with GaAs saturable absorber near 1050 nm
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- 作者：Hongwei Chu ; Shengzhi Zhao ; Kejian Yang ; Yuefei Li ; Dechun Li ; Guiqiu Li ; Jia Zhao ; Wenchao Qiao ; Xiaodong Xu ; Juqing Di ; Lihe Zheng ; Jun Xu
- 关键词：Yb ; YAG crystal ; Passive Q-switch ; Dual-wavelength
- 刊名：Optics and Laser Technology
- 出版年：March, 2014
- 年：2014
- 卷：56
- 期：Complete
- 页码：398-403
- 全文大小：1024 K
文摘
A diode-end-pumped passively Q-switched ytterbium-doped yttrium aluminum garnet (Yb:YAG) laser with gallium arsenide (GaAs) wafer as saturable absorber has been realized. In the experiment, two pieces of GaAs wafers with respective thicknesses of 400 and 700 渭m were used respectively. The output laser characteristics such as the pulse duration, single pulse energy and peak power, have been measured. By using thicker GaAs wafer as saturable absorber, a minimum pulse duration of 3.5 ns was obtained with an average output power of 361 mW and a pulse repetition rate (PRR) of 25 kHz, corresponding to a single pulse energy of 19.6 渭J and a peak power of 5.7 kW. With a 400 渭m-thick GaAs wafer as saturable absorber, a maximum output power of 469 mW was achieved. The central wavelength of the laser was measured to be 1050.4 nm at pump power of 7.8 W and dual wavelength operation peaked at 1049.3 nm and 1051.6 nm was observed at a high pump power of 10 W. By considering Gaussian spatial distribution and the thermal effects in the gain medium, the coupled rate equations for passively Q-switched Yb:YAG laser with GaAs saturable absorber were given.