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Gas-filled hollow-core photonic crystal fiber (PCF) is used for efficientnonlinear temporal compression of femtosecond laser pulses, two main schemesbeing direct soliton-effect self-compression, and spectral broadening followedby phase compensation. To obtain stable compressed pulses, it is crucial toavoid decoherence through modulational instability (MI) during spectralbroadening. Here we show that changes in dispersion due to spectralanti-crossings between the fundamental core mode and core wall resonances inanti-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 thenormal dispersion region.

Modulational-instability-free pulse compression in anti-resonant hollow-core photonic crystal fiber