Abstract
AbstractWe have developed a new rare‐earth calcium oxyborate crystal GdxY1‐xCa4O(BO3)3 (GdYCOB) in order to control birefringence in nonlinear optical crystals. This GdYCOB has been grown by the Czochralski technique. In addition, we have succeeded in generating noncritically phase‐matched (NCPM) second and third harmonics of Nd:YAG laser radiation. We observed two types of photoinduced damage in high‐power third‐harmonic generation (THG). We report the prevention of these kinds of damage by means of an elevated crystal temperature and describe THG performance in the GdYCOB crystal. © 2001 Scripta Technica, Electr Eng Jpn, 136(2): 26–30, 2001
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