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18 February 2009Control of the pulse duration in a diode-pumped doubly passively Qswitched Nd:YVO4 laser with Cr4+:YAG and GaAs saturable absorbers
Using both Cr4+:YAG and GaAs saturable absorbers in the same cavity, a diode-pumped doubly passively Q-switched
Nd:YVO4 laser is realized. Compared with the solely passively Q-switched laser Cr4+:YAG or GaAs, the pulse shape of doubly Q-switched laser is more symmetric and the pulse duration is compressed. The technique to control the pulse
duration has been studied. With different position of the saturable absorber, the pulse duration changes in the range from
41.8ns to 118ns at the pump power of 4.47W, respectively. A rate equation model is introduced to theoretically analyze
the results obtained in the experiment, in which the Gaussian spatial distribution of the intracavity photon density and the
longitudinal variation of the photon density are taken into account. The numerical calculations of the rate equations are
consistent with the experimental results.
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Haikun Zhang, Yuan Yuan, Zhong Zhang, Xiupeng Zheng, Shengzhi Zhao, Kejian Yang, "Control of the pulse duration in a diode-pumped doubly passively Q-switched Nd:YVO4 laser with Cr4+:YAG and GaAs saturable absorbers," Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72761H (18 February 2009);