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坩埚下降法沿＜０１０＞和＜００１＞方向生长了直径达到２５ｍｍ的完整透明的Ｃａ４ＹＯ（ＢＯ３）３ （ＹＣＯＢ）晶体．化学腐蚀结果表明，所生长晶体无孪晶或亚晶界等缺陷，晶体尾部的位错密度 不超过１８００／ｃｍ２测量了ＹＣＯＢ的透射光谱，其截止波长为２００ｎｍ进行了ＹＣＯＢ晶体对 Ｎｄ：ＹＡＧ激光的二次倍频实验．通过与ＫＤＰ晶体对比，计算出ＹＣＯＢ晶体的有效非线性系数 在Ⅰ型相位匹配方向（θ，φ）＝（６６．３°，１４３．５°）和（６５．９°，３６．５°）上分别为１．４５ｐｍ／Ｖ和０．９１ｐｍ／Ｖ； 大于ＫＤＰ和 ＬＢＯ晶体．在脉冲宽度１０ｎｓ的 Ｎｄ：ＹＡＧ激光单脉冲辐射下ＹＣＯＢ晶体出现体 损伤的激光损伤阈值不低于８５ＧＷ／ｃｍ２．
The crucible down method grows completely transparent Ca4YO (BO3) 3 (YCOB) crystals up to 25 mm in diameter in the <010> and <001> directions. The results of chemical etching show that there is no twins or subgrains defects in the grown crystal, the dislocation density of the tail of the crystal does not exceed 1800 / cm2 and the transmission spectrum of YCOB is measured. The cutoff wavelength of the YCOB crystal is 200nm. The second frequency doubling experiment. By comparing with KDP crystal, the effective nonlinear coefficient of YCOB crystal is calculated in the phase matching direction of type Ⅰ (θ, φ) = (66.3 °, 143.5 °) and (65.9 °, 36.5 °) Respectively 1.45pm / V and 0.91pm / V; larger than KDP and LBO crystals. The laser damage threshold of YCOB crystal body damage is not less than 85GW / cm2 under single-pulse Nd: YAG laser pulse with a pulse width of 10ns.