中国激光, 2011, 38 (4): 0411002, 网络出版: 2011-03-24
铌酸锂晶体中参量振荡产生高功率可调谐太赫兹波的实验研究
Experimental Investigation of High-Power Tunable THz-Wave Parametric Oscillator Based upon MgO∶LiNbO3 Crystal
非线性光学 太赫兹波 太赫兹波参量振荡器 电磁耦子 nonlinear optics terahertz wave terahertz wave parametric oscillator polariton
摘要
利用一块大体积MgO∶LiNbO3晶体，采用浅表垂直出射方式构成太赫兹(THz)波参量振荡器(TPO)，实现了高功率可调谐的THz波输出，调谐范围为0.8～2.8 THz。当抽运功率密度为197.4 MW/cm2时，在1.73 THz处每个THz脉冲的最大输出能量为173.9 nJ,对应的能量转换效率为2.2×10-6。实验过程中观察到了一阶和二阶斯托克斯(Stokes)光，一阶Stokes光相对于抽运光的频移等于产生的THz波的频率。
Abstract
High-power nanosecond pulsed terahertz (THz)-wave radiation is achieved via a surface-emitted MgO∶LiNbO3 terahertz parametric oscillator (TPO). THz-wave radiation from 0.8 THz to 2.8 THz is obtained. The maximum THz-wave output is 173.9 nJ per pulse at 1.73 THz while the pump power density is 197.4 MW/cm2. The corresponding energy conversion efficiency is 2.2×10-6. During the experiments the first-order and the second-order Stokes waves are observed. The frequency shift of the first-order Stokes wave is equivalent to the frequency of generated THz-wave.
李忠洋, 姚建铨, 徐德刚, 钟凯, 邴丕彬, 汪静丽. 铌酸锂晶体中参量振荡产生高功率可调谐太赫兹波的实验研究[J]. 中国激光, 2011, 38(4): 0411002. Li Zhongyang, Yao Jianquan, Xu Degang, Zhong Kai, Bing Pibin, Wang Jingli. Experimental Investigation of High-Power Tunable THz-Wave Parametric Oscillator Based upon MgO∶LiNbO3 Crystal[J]. Chinese Journal of Lasers, 2011, 38(4): 0411002.
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