We have developed Gd_<0.28>Y_<0.72>Ca_4O(BO_3)_3(Gd_xY_<1-X>OB) crystal in order to control optical birefringence. And this crystal is possible to generate (θ,φ)=(90°,90°) phase matched third harmonic of 1064nm light. Furthermore we have grown and characterized La_xGd_<1-X>COB crystal for noncrytical phase-matching of 800nm band IR lasers.
