本文报道了布里奇曼法生长的高品质Cr:iSrAlF6 晶体及其激光特性.采用固相氟化反应除去原料中的氧化物和水.在较小的温度梯度和较慢的生长速率下生长出的Cr:iSrAlF6晶体尺寸达到φ20mm×130mm.均匀的Cr3+掺杂浓度为1～15mol%.从XRD谱图计算出的Cr:iSAF晶体点阵参数为a=0.502nm,c=0.967nm.测试了晶体的吸收曲线,并分析了其吸收与能带结构的关系.实现了闪光灯泵浦的Cr:iSAF激光器运转,激光转换斜效率达到5.85%.
High quality Cr:iSrAlF6 (abbreviated as Cr:iSAF) crystals were grown by Bridgman method and their laser performance are reported in this paper. The starting materials were treated using a solid fluorinating agent to remove oxides and water. The size of Cr:LiSrAlF6 crystals, which were grown in a small temperature gradient at a slow growth rate, is up to 20mm in diameter and 130mm in length. 1-15mol% homogeneous Cr3+ doping concentration can be realized. From the XRD spectrum of Cr:iSAF, the lattice parameters are figured out to be a=0.502nm and c=0.967nm. The absorption spectrum of Cr:iSAF was measured and the causes bringing about the absorptions were discussed. Flashlamp-pumped Cr:iSAF laser action was realized. The slope efficiency of flashlamp-pumping is up to 5.85%.
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