Abstract

In this paper we have demonstrated an efficient generation of 355 nm radiation by a diode-end-pumped Nd:YAG/Nd:YVO4 passively Q-switched 1064 nm laser. Cr:YAG is used as a saturable absorber for pulse generation. Compared to Nd:YAG/Cr:YAG, a passively Q-switched 1064 nm laser with higher polarization ratio is obtained in an Nd:YAG/Nd:YVO4/Cr:YAG configuration, which is helpful to nonlinear frequency conversion. The maximum output power of 8.56 W at 1064 nm is obtained with the pulse repetition rate of 38.6 kHz. Under incident pump power of 25.8 W the polarization ratio of 1064 nm is more than 151. Type I and type II critical phase-matching lithium triborate are used as nonlinear frequency conversion crystals. A tripling harmonic-generation output power of 2.22 W at 355 nm is achieved.

© 2016 Optical Society of America

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