Research on Growth and Second-Harmonic Generation of YCOB Crystals

Abstract

Abstract: Crack-free and transparent Ca₄YO(BO₃)₃ (YCOB) crystals with 25 mm diameter were grown by
the vertical Bridgman method in <010> and <001> directions. The results of chemical etching indicate that there are no sub-boundaries or twins
in the crystal, and the density of dislocations observed at top region of a crystal is less than 1800/cm². The measured transmission spectrum
shows that the crystal has wide transmission range with absorption edge at 200nm. The SHG of a Nd:YAG laser was performed for YCOB crystals in
comparison with KDP crystal, the effective nonlinear coefficients (d_eff) of YCOB in type I phase matching directions of (θ, φ)=(66.3℃,
143.5℃) and (65.9℃, 36.5℃) were estimated to be 1.45pm/V and o.91pm/V respectively. The bulk damage threshold was observed as
85GW/cm² for single pulse of a Nd:YAG laser with 10ns pulse duration.

Key words: YCOB, crystal growth, Bridgman method, second-harmonic generation, laser damage threshold

CLC Number:

O782

LUO Jun,QIAN Shi-Xiong,FAN Shi-Ji,WANG Jin-Chang,ZHONG Zhen-Wu,XU Jia-Yue. Research on Growth and Second-Harmonic Generation of YCOB Crystals[J]. Journal of Inorganic Materials.

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Research on Growth and Second-Harmonic Generation of YCOB Crystals

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