研究了溶液配比和降温速率对K2Al2B2O7(KABO)晶体生长的影响,发现NaF与KABO的适宜比例为2:1,晶体生长的合适降温速率为(0.1～5)℃/d,NaF为合适助熔剂.籽晶的取向也影响晶体的质量,[110]方向是KABO晶体生长的最佳生长方向;采用顶部籽晶技术,以NaF为助熔剂可生长出尺寸为50 mm×20 mm×17mm、重30 g的高光学质量KABO透明单晶.晶体对波长2500nm以上的光表现出各向异性吸收,紫外截止边为180 nm.用V型棱镜法测出的KABO晶体折射率拟合出了Sellmeier方程,计算了SHG相位匹配范围,一类相位匹配最短倍频波长为225.5 nm.KABO晶体的266 nm SHG相位匹配角为58.1°.长度为3.6 mm的晶体Nd:YAG激光器四倍频输出能量转换效率为12.3%.
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