## Abstract

A nonlinear optical crystal ${\mathrm{YCa}}_{4}\mathrm{O}{\left({\mathrm{BO}}_{3}\right)}_{3}$ (YCOB) is phase matchable for third-harmonic generation (THG) of a Nd:YAG laser by type I mixing between 1.064 and $0.532\mu \mathrm{m}$. By partial substitution of Gd for Y in YCOB, a solid solution ${\mathrm{Gd}}_{x}{\mathrm{Y}}_{1-x}{\mathrm{Ca}}_{4}\mathrm{O}{\left({\mathrm{BO}}_{3}\right)}_{3}$ gradually changes the phase-matching angles of THG to $\left(\theta ,\varphi \right)=\left({90}^{\xb0},{90}^{\xb0}\right)$. We present the properties of noncritically phase-matched THG in ${\mathrm{Gd}}_{x}{\mathrm{Y}}_{1-x}{\mathrm{Ca}}_{4}\mathrm{O}{\left({\mathrm{BO}}_{3}\right)}_{3}$ $\left(x=0.28\right)$.

© 1999 Optical Society of America

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