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Studying Quasi-Parametric Amplifications: From Multiple -Symmetric Phase Transitions to Non-Hermitian Sensing
- 发表刊物：ACS Photonics
- 摘要：Quasi-parametric amplification (QPA) is a nonlinear interaction in which the idler wave is depleted through a loss mechanism. QPA plays an important role in signal amplification in ultrafast photonics and quantum light generation. In this report, we explore the generalized features characterized by non-Hermitian parity-time () symmetry in the QPA process and uncover multiple -symmetric phase transitions in such a QPA process in which transitions are ultrasensitive to external parameters. In particular, we demonstrate the feasibility of detection of 10–11 inhomogeneities of the doped absorber, which is several orders of magnitude more sensitive than similar measurements performed in a linear absorption regime. In doing so, we reveal a family of -symmetric phase transitions appearing in the QPA process and provide a distinctive nonlinear optical sensing mechanism for precise optical measurements.
- 卷号：11
- 期号：11
- 页面范围：4662-4670
- 是否译文：否
- 发表时间：2024-10-09
