I.-S. Kima, C. Jungb, *, and D.-K. Koa, b, **
a Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology,
1 Oryong-dong, Buk-gu, Gwangju 500–712, Republic of Korea
b Advanced Photonics Research Institute, Gwangju Institute of Science and Technology,
1 Oryong-dong, Buk-gu, Gwangju 500–712, Republic of Korea
*e-mail: csjung@gist.ac.kr
**e-mail: dkko@gist.ac.kr
Received July 19, 2011; in final form, November 17, 2011; published online March 6, 2012
Abstract—We report a high repetition rate Q-switched Nd:YVO4/Cr4+:YAG micro laser with small pump
power. Unwanted defects in pulse train, which are inherently large in passively Q-switched laser, was simply
minimized by controlling temperature of Nd:YVO4/Cr4+:YAG medium. When T0 = 90% Cr4+:YAG and ROC=
90% output coupler were used, Q-switched Nd:YVO4/Cr4+:YAG micro laser showed the optimum output; max-
imum output power of 58 mW, optical-to-optical efficiency of 9.1%, repetition rate of 1.1 MHz, and pulse width
of 57 ns were achieved with 640 mW pumping. MHz-order repetition rate in Nd:YVO4/Cr4+:YAG Q-switched
laser with low pumping (<1 W) is the highest value to the best of our knowledge.
DOI: 10.1134/S1054660X12040044
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