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arXiv 2104.07928physics.opticsquant-ph
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准静态光参量放大

Quasi-static Optical Parametric Amplification

Marc Jankowski, Nayara Jornod, Carsten Langrock, Boris Desiatov, Alireza Marandi, Marko Lončar, Martin M. Fejer

摘要:

高增益光学参量放大是一种重要的非线性过程,既可作为相干红外线光源,也可作为非经典光源。在这项工作中,我们实验证明了一种方法,使非常大的参数增益与低能量要求的光参量放大。在飞秒脉冲驱动的传统非线性介质中,多个色散阶数限制了可用于参量放大的有效相互作用长度。在这里,我们使用周期性极化薄膜铌酸锂纳米波导中可用的色散工程来一次消除多个色散阶。结果是准静态过程;与短泵浦脉冲相关联的大峰值强度可以为信号光子提供增益,而不会经历脉冲失真或时间走离。我们的特点是在这些波导中使用光学参量产生,真空波动放大到宏观强度的参数增益。当驱动脉冲能量超过10 pJ时,我们观察到高达88 dB(146 dB/cm)的饱和参量增益。这里所示的设备实现饱和的光学参量产生与数量级小于以前的技术的脉冲能量。

英文摘要:

High-gain optical parametric amplification is an important nonlinear process used both as a source of coherent infrared light and as a source of nonclassical light. In this work, we experimentally demonstrate an approach to optical parametric amplification that enables extremely large parametric gains with low energy requirements. In conventional nonlinear media driven by femtosecond pulses, multiple dispersion orders limit the effective interaction length available for parametric amplification. Here, we use the dispersion engineering available in periodically poled thin-film lithium niobate nanowaveguides to eliminate several dispersion orders at once. The result is a quasi-static process; the large peak intensity associated with a short pump pulse can provide gain to signal photons without undergoing pulse distortion or temporal walk-off. We characterize the parametric gain available in these waveguides using optical parametric generation, where vacuum fluctuations are amplified to macroscopic intensities. When driven with pulse energies in excess of 10 pJ, we observe saturated parametric gains as large as 88 dB (146 dB/cm). The devices shown here achieve saturated optical parametric generation with orders of magnitude less pulse energy than previous techniques.

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