Highly Efficient, Broadly-Tunable Megawatt Pulse Source for Deep-Tissue Multiphoton Microscopy Based on Self-Phase Modulation in Argon-Filled Hollow-Core Fiber

A fiber-based source of femtosecond pulses with multi-megawatt peak power, tunable from 850 nm to 1700 nm, is developed using self-phase modulation in argon-filled hollow-core fiber. This approach enables efficient generation of high-energy ultrashort pulses across a wide wavelength range for deep-tissue multiphoton imaging.