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

在单一Nd: LiTaO_3晶体中，用简单的谐振腔结构证明了1 σ和π分别在1.092和1.082 μ m处产生激光。采用pi和sigma激光，得到的阈值分别为11mW和8mW，斜率效率分别为16.8%和11.7%。ii .在块畴倒转单Nd: LiTaO_3晶体中实现了激光增益和电光效应相结合的集成电光调q激光器。基于该技术的调q激光器可产生24.7ns脉冲，脉冲频率为150Hz，峰值功率为148W。本文还演示了用二极管激光器进行紧凑的调q操作。iii .我们展示了周期极化Nd: LiTaO_3晶体的腔内QPM-SHG和同时调q操作。这是通过结合利用被激活主体的非线性和电光特性而成为可能的。利用该方法，用0.7W光纤耦合LD抽运获得了峰值功率为2.6W的39ns绿色脉冲。

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.