调制不稳定性
光子晶体光纤
脉冲压缩
光学
飞秒
色散(光学)
材料科学
多普勒展宽
自相位调制
啁啾声
芯(光纤)
光纤
激光器
物理
非线性光学
不稳定性
谱线
电信
机械
计算机科学
雷达
天文
作者
Felix Köttig,Francesco Tani,P. St. J. Russell
出处
期刊:Optics Letters
[The Optical Society]
日期:2020-04-30
卷期号:45 (14): 4044-4044
被引量:3
摘要
Gas-filled hollow-core photonic crystal fiber (PCF) is used for efficient nonlinear temporal compression of femtosecond laser pulses, two main schemes being direct soliton-effect self-compression, and spectral broadening followed by phase compensation. To obtain stable compressed pulses, it is crucial to avoid decoherence through modulational instability (MI) during spectral broadening. Here we show that changes in dispersion due to spectral anti-crossings between the fundamental core mode and core wall resonances in anti-resonant-guiding hollow-core PCF can strongly alter the MI gain spectrum, enabling MI-free pulse compression for optimized fiber designs. In addition, higher-order dispersion can introduce MI even when the pump pulses lie in the normal dispersion region.
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