Continuous-Wave Intracavity Frequency-Doubled
Nd:YAGKTiOPO₄ Red Laser¹

D. Y. Bai^a, J. Zou^b, *, and X. Gao^c

^a School of Electronics and Information Engineering, Changchun University of Science and Technology,
Changchun, 130022 China

^b Electronic and Information Engineering College, Changchun University, Changchun, 130022 China

^c National Key Laboratory of High Power Semiconductor Lasers, Changchun University of Science and Technology,
Changchun, 130022 China

*e-mail: zouji888@sohu.com

Received August 30, 2011; in final form, August 31, 2011; published online December 28, 2011

Abstract—Efficient and compact red laser output at 669 nm is generated by intracavity frequency doubling of
a continuous-wave (CW) diode-pumped Nd:YAG laser at 1338 nm. With 16.9 W of diode pump power and the
frequency-doubling crystal KTiOPO₄ (KTP), a maximum output power of 582 mW in the red spectral range at
669 nm has been achieved, corresponding to an optical-to-optical conversion efficiency of 3.4%; the output
power stability over 4 h is better than 3.6%. To the best of our knowledge, this is first work on intracavity fre-
quency doubling of a diode pumped Nd:YAG laser at 669 nm.

DOI: 10.1134/S1054660X12020028

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