Abstract

A yttrium aluminum borate [${\mathrm{YAl}}_3({\mathrm{BO}}_3{)}_4$] (YAB) crystal with UV cutoff wavelength of $165\mathrm{nm}$ is used as the nonlinear optical crystal for fourth harmonic generation. The fundamental frequency laser at $1064\mathrm{nm}$ from an Nd:${\mathrm{YVO}}_4$ master oscillator power amplifier laser was frequency doubled to $532\mathrm{nm}$. Using the type I phase-matching YAB crystal, a $5.05\mathrm{W}$ average power $266\mathrm{nm}$ UV laser was obtained at the pulse repetition frequency of $65\mathrm{kHz}$, corresponding to the conversion efficiency of 12.3% from 532 to $266\mathrm{nm}$. The experimental results show great potential for the application of using YAB as a nonlinear optical crystal to get high-power fourth harmonic generation.

© 2011 Optical Society of America

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