Raman Shifting Induced by Cascaded Quadratic Nonlinearities for Terahertz Generation,Laser & Photonics Reviews

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Raman Shifting Induced by Cascaded Quadratic Nonlinearities for Terahertz Generation
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-09-02 , DOI: 10.1002/lpor.202000109
Koustuban Ravi _{1,

2} , Franz X. Kärtner _{1,

2,

3}

Affiliation

Cascaded quadratic optical nonlinearities are well known for producing effective third‐order nonlinear optical effects such as self‐phase modulation or self‐steepening. As a result, they have been extensively applied in areas such as mode‐locking and pulse compression. In this article, a regime of cascaded quadratic nonlinearities involving highly phase‐matched second‐order interactions is introduced, which produce an effective third‐order nonlinearity analogous to Raman shifting rather than the typical case of self‐phase modulation. This results in a continuous red‐shift of the optical pump frequency rather than spectral broadening. This phenomenon is particularly relevant to terahertz generation, where a continuous red‐shift of the pump frequency resolves current issues of dispersion and laser‐induced damage. In the absence of absorption or dispersion, the presented method results in optical‐to‐terahertz energy conversion efficiencies that approach 100%, which is not possible with conventional cascaded difference‐frequency generation. Designs of aperiodically poled lithium niobate structures are presented, which result in energy conversion efficiencies of 35% even in the presence of dispersion and absorption. The presented work thus addresses an important bottleneck in terahertz generation, which paves the way for the development of compact particle accelerators, X‐ray free‐electron lasers, advanced electron‐beam diagnostics, and various experiments in condensed‐matter physics and chemistry.

中文翻译：

级联二次非线性引起的太赫兹位移拉曼位移

级联二次光学非线性可产生有效的三阶非线性光学效应，例如自相位调制或自加陡度。结果，它们已广泛应用于锁模和脉冲压缩等领域。在本文中，介绍了一种包含高度相位匹配的二阶相互作用的级联二次非线性机制，该机制可产生类似于拉曼位移的有效三阶非线性，而不是自相位调制的典型情况。这导致光泵浦频率连续红移，而不是光谱展宽。这种现象与太赫兹的产生特别相关，泵浦频率的连续红移解决了当前的色散和激光引起的损坏问题。在没有吸收或色散的情况下，提出的方法导致光-太赫兹能量转换效率接近100％，这是常规级联差分频率生成所无法实现的。提出了非周期性极化的铌酸锂结构的设计，即使存在分散和吸收，其能量转换效率也可达到35％。因此，本文提出的工作解决了太赫兹产生的一个重要瓶颈，这为紧凑型粒子加速器，X射线自由电子激光，先进的电子束诊断以及凝聚态物理和化学的各种实验的开发铺平了道路。传统的级联差频生成是不可能的。提出了非周期性极化的铌酸锂结构的设计，即使存在分散和吸收，其能量转换效率也可达到35％。因此，本文提出的工作解决了太赫兹产生的一个重要瓶颈，这为紧凑型粒子加速器，X射线自由电子激光，先进的电子束诊断以及凝聚态物理和化学的各种实验的开发铺平了道路。传统的级联差频生成是不可能的。提出了非周期性极化的铌酸锂结构的设计，即使在存在分散和吸收的情况下，其能量转换效率也可达到35％。因此，本文提出的工作解决了太赫兹产生的一个重要瓶颈，这为紧凑型粒子加速器，X射线自由电子激光，先进的电子束诊断以及凝聚态物理和化学的各种实验的开发铺平了道路。

更新日期：2020-09-02

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