中国激光, 2019, 46 (6): 0614027, 网络出版: 2019-06-14
大能量磷酸钛氧钾太赫兹参量源 下载: 1081次
Large-Pulse-Energy Terahertz Parametric Source Based on KTiOPO4 Crystal
太赫兹技术 太赫兹波 受激电磁耦子散射 磷酸钛氧钾晶体 terahertz technology terahertz wave stimulated polariton scattering potassium titanyl phosphate crystal
摘要
使用磷酸钛氧钾(KTiOPO4,KTP)晶体,采用斯托克斯参量振荡器与太赫兹波表面垂直出射的斯托克斯参量放大器相结合的实验方案,获得了大能量的太赫兹波输出。抽运源是调Q 脉冲激光器,输出波长为1064.2 nm,脉宽为7.5 ns,脉冲重复频率为1 Hz。斯托克斯光波长为1086.2 nm,抽运光与斯托克斯光的夹角为4.4°,太赫兹波频率为5.7 THz。抽运光路上的延时装置可以保证抽运光脉冲与待放大斯托克斯光脉冲有很好的时间重合性。当抽运光脉冲能量为770 mJ、待放大斯托克斯光脉冲能量为16.8 mJ时,放大后斯托克斯光脉冲能量为185.4 mJ,太赫兹波脉冲能量最大为6.4 μJ。
Abstract
In this study, the high-energy terahertz-wave pulses were generated using a potassium titanyl phosphate (KTiOPO4, KTP) crystal and an experimental scheme that combines a Stokes parametric oscillator and a Stokes parametric amplifier involving the vertical surface emission of terahertz waves. The pump source was a Q-switched laser with an output wavelength of 1064.2 nm, a pulse width of 7.5 ns, and a pulse repetition rate of 1 Hz. The Stokes light wavelength is 1086.2 nm, the angle between the pump and Stokes beams is 4.4°, and the terahertz wave frequency is 5.7 THz. The time-delay device on the pump-light path can ensure that the pump light pulse has a good time coincidence with the Stokes light pulse to be amplified. When the pump light pulse energy is 770 mJ and the Stokes light pulse energy to be amplified is 16.8 mJ, the amplified Stokes light pulse energy is 185.4 mJ and the maximum terahertz wave pulse energy is 6.4 μJ.
贾晨阳, 张行愚, 丛振华, 秦增光, 刘兆军, 陈晓寒, 臧婕, 李圆, 高飞龙, 焦月, 王伟涛, 张少军. 大能量磷酸钛氧钾太赫兹参量源[J]. 中国激光, 2019, 46(6): 0614027. Chenyang Jia, Xingyu Zhang, Zhenhua Cong, Zengguang Qin, Zhaojun Liu, Xiaohan Chen, Jie Zang, Yuan Li, Feilong Gao, Yue Jiao, Weitao Wang, Shaojun Zhang. Large-Pulse-Energy Terahertz Parametric Source Based on KTiOPO4 Crystal[J]. Chinese Journal of Lasers, 2019, 46(6): 0614027.