Research on Multi-Functional Nonlinear-Optic Devices using Domain Superlattices

用简单的谐振腔结构在Nd：LiTaO_3单晶中获得了1.092 μ m和1.082 μ m的I. σ和π激光。在未镀膜的Nd：LiTaO_3晶体中，分别获得了11mW和8mW的阈值功率和16.8%和11.7%的斜率效率。II.在体畴反转的Nd：LiTaO_3单晶中，实现了激光增益和电光效应的综合电光调Q激光器。利用该技术实现了150Hz、24.7ns、峰值功率为148W的调Q激光输出，并实现了与半导体激光器的紧凑型调Q运转。这已经成为可能的装置的非线性和电光特性的激活主机的组合开发。用0.7W的光纤耦合LD泵浦，获得了39ns的绿色光脉冲，峰值功率为2.6W。

I.sigma and pi lasing at 1.092mum and 1.082mum, respectively in single Nd : LiTaO_3 crystal with simple resonator structures have been demonstrated. Threshold values of about 11mW,8mW and slope efficiency of 16.8%, 11.7% are obtained from uncoated samples with pi and sigma lasing, respectively.II.An integrated electro-optic Q-switched laser by combining the laser gain and electro-optic effect in a bulk domain inverted single Nd : LiTaO_3 crystal has been demonstrated. The Q-switched laser based on this technique could generate 24.7ns pulses at 150Hz with peak power of 148W.Compact Q-switched operation with a diode laser has also been demonstrated here.III.We showed intracavity QPM-SHG and simultaneous Q-switched operation of periodically poled Nd : LiTaO_3 crystal. This has become possible by means of the combined exploitation of both the nonlinear and the electro-optic properties of the activated host. Using this method 39ns green pulses with a peak power of 2.6W have been obtained by pumping with a 0.7W fiber coupled LD.