Abstract

We describe experimental results with a diode-pumped, passively Q-switched extracavity second- and third-harmonic generation. Cr:YAG is used as a saturable absorber for pulse generation. Taking into account the thermal effects of Nd:YAG at high incident pump power, we use a short plane-to-plane cavity configuration to take advantage of the maximum pump power and obtain the compactness structure. At the same time, we use the type-I critical phase-matched lithium triborate crystal to generate light at $532\mathrm{nm}$ and mix the residual fundamental at 1064 nm and the second-harmonic wave at $532\mathrm{nm}$ in the type-II critical phase-matched lithium triborate crystal for UV light generation at $355\mathrm{nm}$. A third-harmonic-generation output power of $1.32\text{\hspace{0.17em} W}$ is achieved at the incident pump power of $27.5\text{\hspace{0.17em} W}$, corresponding to an optical-to-optical efficiency of 4.8%. The instability of the UV laser power is less than 5% for 4 h.

© 2007 Optical Society of America

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