Tunable Backward Terahertz-wave Parametric Oscillation
Tunable Backward Terahertz-wave Parametric Oscillation
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可调谐后向太赫兹波参量振荡
DOI：
10.1038/s41598-018-37068-7
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发表时间：
2019
影响因子：
4.6
通讯作者：
Minamide Hiroaki
中科院分区：
文献类型：
--
作者：
Nawata Kouji;Tokizane Yu;Takida Yuma;Minamide Hiroaki
后向光学参量振荡是一种基于光子完全转换的无腔窄带光谱产生技术。很少有证据表明它在非线性光子学方面的潜力，因此，相互作用光波之间的动量守恒机制一直被周期极化结构相位匹配条件下的限制性位形所掩盖。在这里，我们揭示了一个可调机制，在太赫兹区域的相位匹配条件的主动控制。利用准共线相位匹配模型研究了后向太赫兹波参量振荡的可调谐性，确定了后向太赫兹波参量振荡的亚太赫兹至太赫兹频率范围。通过在泵浦光传输线上安装一个无腔器件，可以简单地实现变换受限的太赫兹脉冲。此外，太赫兹波的级联产生提高了光子转换效率，从而使非线性光学及其应用更有前途。这些结果突出了使用现代铁电材料的新能力，并鼓励进一步研究非线性光学。
Backward optical parametric oscillation has attracted attention for cavityless spectral narrowband generation based on perfect photon conversion. Few demonstrations have shown its potential from the aspect of nonlinear photonics; therefore, the mechanisms of momentum conservation among interacting light waves have been concealed by the restricted configuration under the phase-matching condition of periodically poled structures. Here, we unveil a tunable mechanism in the terahertz region by active control of the phase-matching condition. The tunability of backward terahertz-wave parametric oscillation is investigated using a quasi-collinear phase-matching model and its frequency range from the sub-terahertz to terahertz region is identified. Transform-limited terahertz-wave pulse is achieved simply by installing a device on the pump propagating line with no cavity. Moreover, the cascading terahertz-wave generation enhances the photon conversion efficiency, thus making nonlinear optics and its applications more promising. The results highlight new capabilities for using modern ferroelectric materials and encourage further research on nonlinear optics.