Geometry-dependent spectra and coherent transient measurement of nearly degenerate four-wave mixing using two-photon resonance
Geometry-dependent spectra and coherent transient measurement of nearly degenerate four-wave mixing using two-photon resonance
复制标题
使用双光子共振的近简并四波混频的几何相关光谱和相干瞬态测量
DOI：
10.1088/1361-6455/ab4a6e
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Motohiko Yoshimura
中科院分区：
文献类型：
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作者：
Hideaki Hara;Yuki Miyamoto;Takahiro Hiraki;Kei Imamura;Takahiko Masuda;Noboru Sasao;Satoshi Uetake;Akihiro Yoshimi;Koji Yoshimura;Motohiko Yoshimura
我们利用双光子允许的对偶氢的振动跃迁研究了近简并四波混合。利用两个反传播泵浦脉冲制备的对偶氢之间的相干性和触发光子产生信号光子，并研究了信号脉冲能量与触发频率的关系。测量到的光谱取决于几何形状，根据信号脉冲的方向和由反向传播的泵浦脉冲形成的小角度而变化。此外，我们还研究了信号脉冲能量与触发脉冲入射时间的关系。如果触发脉冲相对于泵脉冲稍微延迟，则被测信号脉冲能量高。我们证明了这些几何相关的光谱和相干瞬态响应可以用简单的模型来解释。
We study nearly degenerate four-wave mixing using a two-photon-allowed vibrational transition of parahydrogen. A signal photon is generated by a trigger photon and coherence among parahydrogen, which is prepared by two counterpropagating pump pulses, and we investigate the dependence of the signal pulse energy on the trigger frequency. The measured spectra depend on the geometry, shifting depending on the direction of the signal pulse and on the small angle formed by the counterpropagating pump pulses. Furthermore, we investigate the dependence of signal pulse energy on the incident time of the trigger pulse. The measured signal pulse energy is high if the trigger pulse is delayed slightly with respect to the pump pulses. We demonstrate that these geometry-dependent spectra and coherent-transient response can be explained by using simple models.