基于CO_2激光的AgGaS_2差频产生太赫兹波的数值分析  

Numerical Simulation of Terahertz Wave Generation in AgGaS_2 Crystal Based on CO_2 Laser

作　　者：王翠玲[1] 徐世林[1] 

机构地区：[1]山东科技大学理学院青岛市太赫兹技术重点实验室,山东青岛266590

出　　处：《红外》2012年第9期35-40,共6页Infrared

基　　金：国家自然科学基金项目(61001018);山东科技大学春蕾计划(2010AZZ083)

摘　　要：采用中红外CO_2激光差频产生太赫兹波是提高转换效率和输出功率的一种有效方法。根据差频过程中的三波互作用对AgGaS_2晶体进行了理论分析,数值模拟了oeo类和oee类两种匹配条件下差频产生太赫兹波的角度调谐曲线,并计算了光波在晶体中的走离角和允许参量。另外,还考虑了晶体的有效非线性系数和理论功率转换效率。研究结果表明,AgGaS_2晶体适用于中红外CO_2激光差频产生可广泛调谐的太赫兹波。Using a mid-infrared C02 laser in terahertz difference frequency generation （THz-DFG） is an effective method for improving conversion emciency and output power. According to the three-wave interaction of difference frequency, the AgGaS2 crystal is analyzed theoretically. The angle tunable curves of difference-frequency-generated THz wave under both oeo-type and oee-type phase matching conditions are simulated numerically. The walk-off angle and acceptable parameter of light wave in the crystal are calculated. In addition, the effective nonlinear coefficient and theoretical power conversion efficiency of the crystM are taken into account. The research result shows that the AgGaS2 crystal is suitable for widely tunable THz-DFG with a CO2 laser.

关 键 词：太赫兹波 差频 相位匹配 CO2激光 AgGaS2晶体 

分 类 号：TN21[电子电信—物理电子学]