采用提拉法从近化学计量比的熔体中生长出尺寸为φ20mm×60mm的优质LiNbO3:Cr(CLN)晶体,其光学均匀度为7.05E-005.进行了吸收和荧光光谱的测定研究.吸收谱测试表明:Cr3+离子在晶体中有两个宽且强的吸收带及两个微弱的吸收线,两宽带中心波长分别为481和657nm,对应于4A2→4T1和4A2→4T2两个具有相同的总自旋能级之间的跃迁,在4A2→4T2吸收宽带的长波边缘处有个很小的吸收峰,其波长为727nm,对应于4A2→2E(R线)的跃迁.荧光测试表明:当激发波长为660nm时,CLN晶体荧光宽带和一个较弱的荧光线峰并存,宽带范围为800～982nm,峰值波长为870nm,对应于4T2→2E,4A2的联合能级跃迁,荧光线峰波长约为752nm,其强度较弱,相应于2E→4A2(零声子线)能级跃迁.计算了晶场强度和Racah参数,其Dq,B,G大小分别为1522.1、542.5和3218.7cm-1,Dq/B=2.81,晶体属于强场介质.研究表明,CLN晶体具备可调谐激光晶体的基本光谱要求,且有良好的物化性能,可以实现宽频带可调谐激光输出.又具有较大的倍频系数,有望实现410nm附近紫外的自倍频激光输出.
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