摘要
报道了以MgO：LiNbO2为非线性光学介质，采用85mm长的法布里-珀罗单谐振腔结构形式的光学参变振荡器，产生THz电磁波的实验结果。使用波长为1064nm的Nd：YAGQ开关脉冲激光器作为抽运光源，通过改变入射角度使参变振荡器的相位匹配条件发生变化。采用Si真空量热器，并利用THz波干涉测量仪；或通过测量闲频光的频率对产生的THz波频率进行了测量。实验表明该参变振荡器输出频率调谐范围为0．9～3．0THz。在抽运光能量为20mJ／pulse，脉冲宽度16ns，重复频率50Hz条件下得到输出峰值位于1．2THz，能量为102．5PJ／pulse的THz波输出。通过引入Si棱镜阵列减小了THz波在晶体中的全反射，从而提高THz波的能量输出。使用金属缝隙探测器，对辐射的THz波的波束水平方向空间分布进行了测量，分析了Si棱镜阵列的衍射效应对THz波束空间分布的影响。
The THz wave output with the 85 mm F-P single cavity optical parametric oscillator based on the MgO：LiNbO3 crystal was reported. The Nd：YAG Q-switched laser with 1064 nm was used as the pump source, and the THz wave was tuned by changing the incident angle as well as the phase matching condition. THz wave frequency can be detected with the THz interferometer and the Si bolometer, or by detecting the idle light frequency. Experimental results indicate the THz wave is 0.9-3.0 THz tunable. The peak energy output is 102.5 pJ/pulse at 1.2 THz with the pump energy of 20 mJ/pulse, pulse width of 16 ns, repetition rate of 50 Hz. THz energy output was increased when a Si-prism array was introduced to decrease THz wave＇s total reflection at the interface of crystal. The THz wave beam pattern along the horizontal was measured with a metal-slit-detector. The influence of diffraction effect of the Si prism array on the THz wave beam spatial profile was discussed.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2006年第4期616-620,共5页
Acta Optica Sinica
基金
国家自然科学基金(10390160
10376025
50477011)
陕西省教育厅专项基金(03JK068)资助课题
作者简介
张显斌（1969～），男，西安市人，副教授，主要从事超快光电子器件、激光与物质相互作用的教学及科研工作。E-mail：wuli2@xaut．edu．cn
