885 nm LD End-Pumped 22.7 W High Beam Quality Electro-
Optical Q-Switched Nd:YAG Laser¹

L. Chang^a, *, C. Yang^a, Q. S. Pang^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 15, 2011; in final form, December 21, 2011; published online April 3, 2012

Abstract—We report an 885 nm laser diode (LD) end-pumped high beam quality ( = 1.322, = 1.235)
electro-optical Q-switched Nd:YAG laser with TEM₀₀-mode output for the first time. At the absorbed pump
power of 59.5 W, a 22.7 W 1064 nm laser was achieved at 10 kHz repetition rate with optical-to-optical effi-
ciency of 38.1%. The maximum pulse energy and shortest pulse width were 5.1 mJ and 14.5 ns at 2 kHz repe-
tition rate, and the calculated peak power was 352 kW.

DOI: 10.1134/S1054660X12050040

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