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Pulse width tunable passively mode-locked Nd:YVO4 laser based on hybrid laser gain medium locations
Hua Lin1, Yen-Yin Lin, Yuan-Yao Lin
1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO BOX 800-211, Shanghai 201800, China.
Abstract:
A pulse width tunable passively mode-locked laser with a wavelength of 1,064 nm and two Nd:YVO(4) crystals located in asymmetric positions is demonstrated. By adjusting the pump power of the crystals, the pulse width can be continuously tuned from 8.8 to 20.3 ps at a stable mode-locked repetition rate of 122 MHz. A theoretical model is proposed to describe the experiment results phenomenologically. In this system, a maximum output power of 4.44 W is achieved with a pump of 13.68 W, corresponding to an optical-to-optical efficiency of 32.5%. The beam quality factor, M(2), is found to be M(2)(x) = 1.15 and M(2)(y) = 1.13 in the orthogonal directions at an output power of 3.2 W.
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