Abstract

In this paper we have demonstrated an efficient generation of 355 nm radiation by a diode-end-pumped $\mathrm{Nd}\text{:}\mathrm{YAG}/\mathrm{Nd}\text{:}{\mathrm{YVO}}_4$ 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 $\mathrm{Nd}\text{:}\mathrm{YAG}/\mathrm{Nd}\text{:}{\mathrm{YVO}}_4/\mathrm{Cr}\text{:}\mathrm{YAG}$ 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 $15:1$. 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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