非周期晶格激光器中多波长非线性混频的简并相位匹配
Degenerate phase-matching for multi-wavelength nonlinear mixing in aperiodic lattice lasers
AI总结：
本文通过非线性传输矩阵建模，研究集成太赫兹激光腔中非周期晶格的多波长非线性混频，发现简并相位匹配的缺陷模可增强转换效率，对太赫兹光纤通信的波长复用有重要影响。
摘要：
全息设计的非周期晶格已被证明是一种令人兴奋的工程技术，可用于在太赫兹（THz）半导体激光器中实现电可切换的单频或多频发射。在此，我们采用非线性传输矩阵建模方法来研究集成太赫兹（闲频）激光腔内的多波长非线性（和频或差频）产生，该腔同时支持光（泵浦和信号）波。激光腔包含一个非周期晶格，该晶格调控闲频光子寿命和有效折射率。关键发现是：（i）非线性转换效率在光子寿命较高的闲频频率处表现出共振增强；（ii）泵浦波与闲频波之间的共振相位匹配过程与任何其他色散的缺失一一对应，非周期晶格激光器的最低阈值多波长缺陷模具有简并相位匹配的泵浦频率。这一系列结果将对电可切换的太赫兹光纤通信系统中的波长复用产生重要影响[1]。
英文摘要：
Holographically-designed aperiodic lattices have proven to be an exciting engineering technique for achieving electrically switchable single- or multi-frequency emissions in terahertz (THz) semiconductor lasers. Here, we employ the nonlinear transfer matrix modeling method to investigate multi-wavelength nonlinear (sum- or difference-) frequency generation within an integrated THz (idler) laser cavity that also supports optical (pump and signal) waves. The laser cavity includes an aperiodic lattice, which engineers the idler photon lifetimes and effective refractive indices. The key findings are: (i) the nonlinear conversion efficiency reveals resonant enhancement at those idler frequencies where the photon lifetime is high; (ii) the resonant phase-matching process between the pump and idler waves has a one-to-one link with absence of any other dispersion, the lowest threshold, multi-wavelength defect modes of the aperiodic lattice laser have degenerate phase-matched pump frequencies. This set of results will potentially have a significant impact on the wavelength multiplexing in electronically switchable THz-over-fiber communication systems [1].
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