利用量子干涉产生连续波THz辐射
Generation of continuous-wave THz radiation by use of quantum interference
摘要：
我们提出了一种产生连续波太赫兹辐射的方案。该方案需要一种介质，其中可以选择$Λ$配置中的三个离散状态，在两个较低的亚稳态之间具有太赫兹频率跃迁。我们考虑三频连续波电磁波（e.m.）通过$Λ$介质辐射。在共振激发下，由于跃迁的量子干涉，介质的吸收被大大降低，而非线性极化率被增强。这导致了非常有效的能量转移之间的电。波提供了太赫兹产生的可能性。我们证明，在这种技术中的光子转换效率接近统一。
英文摘要：
We propose a scheme for generation of continuous-wave THz radiation. The scheme requires a medium where three discrete states in a $Λ$ configuration can be selected, with the THz-frequency transition between the two lower metastable states. We consider the propagation of three-frequency continuous-wave electromagnetic (e.m.) radiation through a $Λ$ medium. Under resonant excitation, the medium absorption can be strongly reduced due to quantum interference of transitions, while the nonlinear susceptibility is enhanced. This leads to very efficient energy transfer between the e.m. waves providing a possibility for THz generation. We demonstrate that the photon conversion efficiency is approaching unity in this technique.
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