914 nm LD End-Pumped 31.8 W High Beam Quality
E-O Q-switched Nd:YVO₄ Laser without Intracavity Polarizer¹

L. Chang^a, *, C. Yang^a, X. J. Yi^a, Q. K. Ai^a, L. Y. Chen^a, M. Chen^a, **,
G. Li^a, J. H. Yang^b, and Y. F. Ma^b

^a Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

^b Beijing GK Laser Technology Co., Ltd, Beijing 100085, China

*e-mail: constantvip@yahoo.com.cn
**e-mail: chenmeng@bjut.edu.cn

Received December 27, 2011; in final form, December 28, 2011; published online August 1, 2012

Abstract—We report a 914 nm LD end-pumped high power, high beam quality ( = 1.378, = 1.287)
electro-optical Q-switched Nd:YVO₄ laser with TEM₀₀-mode output. At the absorbed pump power of 67.6W,
a 31.8 W 1064 nm Q-switched laser with 43 ns pulse duration was achieved at 100 kHz repetition rate, corre-
sponding to an optical-to-optical efficiency of 47%. The maximum pulse energy and shortest pulse width were
1.67 mJ and 18.5 ns at 10 kHz, and the calculated peak power was 90.3 kW. To the best of our knowledge, this
is the highest Q-switched output power ever obtained for a Nd:YVO₄ oscillator pumped at914 nm.

DOI: 10.1134/S1054660X12090022

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