A compact continuously tunable dual-wavelength source of radiation based on a diode pumped Nd:AG laser and an intracavity degenerate optical parametric oscillator (IDOPO) was demonstrated for the first time. The generation of two pulses of radiation with mutually orthogonal polarization and a wavelength difference from 0 to 500 nm is realized. The pulse energy reached ~1 mJ with a pulse duration of 10 ns at a repetition rate up to 1 kHz. Terahertz (THz) radiation was obtained using a difference frequency generation DFG in a single crystal ZnGeP 2 . The tuning range of the THz radiation in the wavelength range ~120–270 µ m was realized. The maximum average power of THz radiation achieved in the experiment was ~3.3 nW at a wavelength of λ = 181 µ m.

中文翻译：

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双波长简并光学参量振荡器泵浦的ZnGeP 2单晶中的可调THz辐射

首次展示了基于二极管泵浦Nd：AG激光器和腔内简并光参量振荡器（IDOPO）的紧凑型连续可调双波长辐​​射源。实现了具有相互正交的偏振和0至500nm的波长差的两个辐射脉冲的产生。脉冲能量达到〜1 mJ，脉冲持续时间为10 ns，重复频率高达1 kHz。在单晶ZnGeP 2中使用差分频率生成DFG获得了太赫兹（THz）辐射。实现了THz辐射在〜120–270 µm波长范围内的调谐范围。实验中获得的THz辐射的最大平均功率在λ= 181 µm的波长下约为3.3 nW。