硅酸盐学报

采用提拉法在优化条件下生长锌钕双掺的铌酸锂晶体。Nd2O3和ZnO的掺入量分别为0.2％和6％(in mole)。提拉速度为1 mm/h,旋转速度为20 r/min,生长的晶体尺寸为φ30 mm×40 mm。晶体的红外光谱测试表明,Zn:Nd:LiNbO3晶体的H-O振动吸收蜂发生了劈裂,在3 483 cm-1和3 530 cm-1形成吸收,而Nd:LiNbO3晶体的H-O振动吸收峰在3 483 cm-1处形成吸收。通过光斑畸变法测得Zn:Nd:LiNbO3晶体的光折变阈值强度为1.82×104W/cm2,比Nd:LiNbO3晶体的1.62×103W/cm2高1个数量级;采用逐点扫描的方式测得Zn:Nd:LiNbO3晶体双折射梯度为3×10-5cm-1。,比Nd:LiNbO3晶体的双折射梯度6×10-4cm-1小1个数量级。用合适的泵浦光测试了晶体自倍频性质,在150℃时当泵浦脉冲光能为40 mJ时,晶体的自倍频输出光能为35μJ。

The laser crystal Zn- Nd:LiNbO3 co-doped with 0.2%Nd2O3 and 6% ZnO (in mole) was grown by Czochralski method under optimized conditions of the pulling speed 1mm/h and the rotating rate 20 r/min. The grown crystal is 30 mm in diameter and 40 mm in length. The infrared transmittance spectrum measured shows two O-H absorption peaks of Zn : Nd: LiNbO3 crystal at 3 483 cm and 3 530 cm-1, in contrast to one absorption peak of Nd: LiNbO3 crystal at 3 483 cm -1 The optical damage resistance ability of Zn: Nd: LiNbO3 crystal was investigated by light spot distortion method and the photorefractive threshold of Zn: Nd: LiNbO3 measured is 1. 82 × 104 mW/cm2, one order of magnitude higher than that of Nd: LiNbO3 crystal, 1. 62 × 103 mW/cm2. The birefringence gradients of Zn : Nd : LiNbO3 and Nd: LiNbO3 are 3 × 10 -5 cm -1 and 6 × 10 4cm -1, respectively. The self-doubling properties of Zn:Nd:LiNbO3 crystal were examined with a proper pump light. The self-doubling output pulse energy of Zn:Nd:LiNbO3 is 35μJ with pump light energy 40 mj at 150℃ .