555 nm Laser Sources Based on Intracavity Frequency
Doubling of Nd:YGG Laser¹

Y. L. Li^a, *, J. H. Li^b, X. H. Liu^b, J. B. Wu^b, and X. Zhang^b

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

^b School of Physics, Northeast Normal University, Changchun 130024, China

*e-mail: liyongliang1973@163.com

Received October 18, 2011; in final form, October 19, 2011; published online February 6, 2012

Abstract—We report for the first time a yellow–green laser at 555 nm generation by intracavity frequency dou-
bling of a continuous wave (CW) laser operation of a 1110 nm Nd-doped yttrium gallium garnet (Nd:YGG)
laser under in-band diode pumping at 808 nm. An LBO crystal, cut for critical type I phase matching is used
for second harmonic generation of the laser. At an incident pump power of 18.5 W, as high as 2.31 W of CW
output power at 555 nm is achieved. The optical-to-optical conversion efficiency is up to 12.4%, and the fluc-
tuation of the yellow–green output power was better than 2.8% in the given 4 h.

DOI: 10.1134/S1054660X12030085

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