Few-cycle laser pulses generation with frequency tuning in a molecular gas-filled hollow-core fiber

We study theoretically a pulse compression method with gasfilled hollow-core fiber based on ultrafast molecular phase modulation. The simulation results show the molecular phase modulation can impart a positive or negative chirp on probe pulse and tune the central wavelength by changing the time delay between the pump and probe pulses. This approach is demonstrated to be suitable for generation of frequency-tunable few-cycle pulses with a smooth spectrum. (C) 2015 Optical Society of Americ