论文标题
抗谐振的空心光子晶体纤维中的无稳定性脉冲压缩
Modulational-instability-free pulse compression in anti-resonant hollow-core photonic crystal fiber
论文作者
论文摘要
充满气体的空心光子晶体纤维（PCF）用于有效的飞秒激光脉冲的非线性时间压缩，两个主要方案是直接孤子效应的自我压缩，光谱扩展，然后进行相位补偿。为了获得稳定的压缩脉冲，至关重要的是，在光谱拓宽期间通过调节不稳定性（MI）避免破裂。在这里，我们表明，由于基本核心模式与核壁共振之间的频谱抗横断性变化，在抗谐振的空心核心PCF中可以强烈改变MI增益光谱，从而实现Mi-Fuls脉冲压缩以进行优化的纤维设计。另外，即使泵脉冲位于正常分散区域，高阶分散也可以引入MI。
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.
