低重复频率3463nm KTiOAsO_4光参量振荡器的研究  

Research of 3463nm KTiOAsO_4 optical parametric oscillator at low repetition frequency

作　　者：牛瑞华[1,2] 李彤[2] 张建伟[2] 任钢[2] 冯国英[1] 周寿桓[1] 

机构地区：[1]四川大学电子信息学院,成都610064 [2]西南技术物理研究所,成都610041

出　　处：《激光技术》2010年第3期351-353,369,共4页Laser Technology

摘　　要：为了研究非线性晶体KTiOAsO_4的光参量振荡特性,根据动量、能量守恒定律和晶体色散方程,采用计算机数值模拟方法,对晶体的相位匹配、增益、有效非线性系数、走离角及允许角曲线进行了理论分析;当晶体采用Ⅱ类相位匹配方式,切割角度为θ=90°,φ=0°时,室温下得到了闲频光波长3463nm,最大单脉冲能量大于22mJ,脉宽不大于35.3ns,束散角不大于8.9mrad,脉冲重复频率为1Hz～40Hz。结果表明,KTiOAsO_4晶体性能优良,非常适合中红外激光输出,为将来输出高能量、高峰值功率中红外激光奠定了基础。In order to study the optical parametric characteristics of KTiOAs04, according to momentum and energy conservation rule and dispersion equation of the crystal, the phase-matching, gain, effective nonlinear coefficient deft, walkoff and accept angle curves were analyzed in theory through numerical simulation. Type- 1I phase-matching of KTiOAsO4 crystal was adopted and the cutting angle θ=90°,the angle φ=0°. In room temperature, the idle wavelength was 3463nm by experiment. The maximum of single pulse energy was more than 22mJ, the pulse width was no more than 35.3ns, the beam divergence was no more than 8.9mrad and the repeating frequency was from 1Hz to 40Hz. The experimental results show that KTiOAsO4 crystal adapts to generate mid-infrared laser, especially to generate high energy and high peak power mid-infrared laser in future.

关 键 词：激光光学 光参量振荡器 中红外激光 相位匹配 KTiOAsO4 

分 类 号：O437[机械工程—光学工程]