中远红外及太赫兹波段非线性晶体硒化镓

Nonlinear Crystals GaSe in Mid, Far-infrared and Terahertz Range

中远红外及太赫兹波段激光在国防和民用领域都有非常突出和迫切的需求,硒化镓(GaSe)晶体是一综合性能优异的红外非线性光学材料,通过差频产生和光学参量振荡可实现这两个波段的可调谐激光输出。综述了GaSe晶体及掺杂晶体在合成、生长、掺杂性能及差频产生中远红外及太赫兹辐射方面的最新研究成果,重点介绍了GaSe晶体及掺杂晶体的光学、力学性能,非线性性能及它们在频率转换方面的应用性能。通过全面的分析找出综合性能最优的掺杂晶体种类。

GaSe crystal is one of infrared nonlinear optical materials with the superior performance. The tunable laser in mid, far-IR and terahertz（THz） bands can be obtained through the continuous-wave（CW） difference-frequency generation and optical parametric oscillator. Recent developments on the synthesis, growth, doped performances and mid, far-infrared and terahertz radiation by difference frequency generation（DFG） were represented. The emphases focused on the optical properties, mechanical properties, nonlinear properties and their applications in frequency conversion of GaSe and various doped GaSe crystals. The optimal doping crystals could be found by the comprehensive analysis.