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Diode-pumped, passively Q-switched Nd:GdVO_4 green laser with periodically poled KTP and Cr^4+:YAG saturable absorber

2006; Optica Publishing Group; Volume: 23; Issue: 4 Linguagem: Inglês

10.1364/josab.23.000671

1520-8540

Kejian Yang, Shengzhi Zhao, Guiqiu Li, Jing Zou,

Photorefractive and Nonlinear Optics

With a laser diode as the pump source, a passive Q switching of an intracavity frequency-doubling Nd:GdVO4 green laser with periodically poled KTP has been realized with a Cr4+:YAG saturable absorber. The dependences of the average output power, pulse width, pulse repetition rate, pulse energy, and peak power on incident pump power at different small-signal transmissions of Cr4+:YAG are measured. The rate equations considering the Gaussian spatial distribution of the intracavity photon density and the effects of the amplified spontaneous emission (ASE) are presented to simulate the Q-switching process of this laser, and the numerical solutions are in agreement with the experimental results. We have further discussed the influences of the ASE parameter ξ on the laser performance.