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基于LiNbO3晶体垂直表面输出技术,设计了一台小型化外腔THz参量振荡器。利用小型化灯1064nm脉冲激光器泵浦MgO:LiNbO3,通过优化设计三波非共线相位匹配的光学参量振荡腔结构,实现THz垂直晶体表面输出,减少LiNbO3晶体对THz波的吸收,提高了THz波输出光束质量。当在泵浦光能量为128mJ、重复频率为10Hz时,获得THz波的调谐范围为0.69～3.01THz,在1.6THz处获得THz波最大平均功率为10.8μW,脉冲宽度为10ns,对应THz波能量转换效率为8.43×10-6。
Based on LiNbO3 crystal vertical surface output technology, a miniaturized THz parametric oscillator is designed. By using the miniaturized lamp 1064nm pulsed laser to pump MgO: LiNbO3, the optical parametric oscillating cavity structure of three-wave non-collinear phase matching is optimized to realize the THz vertical crystal surface output, reducing the THz wave absorption of LiNbO3 crystal and improving the THz wave output Beam quality. When the pump energy is 128mJ and the repetition frequency is 10Hz, the tuning range of THz wave is 0.69 ~ 3.01THz, the maximum average power of THz wave is 10.8μW at 1.6THz and the pulse width is 10ns, corresponding to THz wave energy Conversion efficiency of 8.43 × 10-6.