Fiber-optic nonlinear wavelength converter for adaptive femtosecond biophotonics

We develop a tunable and reliable accessory for femtosecond ytterbium fiber chirped pulse amplifiers, termed as fiber-optic nonlinear wavelength converter (FNWC), as an adaptive optical source for femtosecond biophotonics. This accessory embowers the laser to produce fiber delivered ~20 nJ pulses with central wavelength across 950-1150 nm, repetition rate across 1-10 MHz, and pulse width across 40-400 fs. The key enabling feature is the surprising suppression of the long-term fiber photodamage in coherent supercontinuum generation using a photonic crystal fiber with large-pitch small-hole lattice. The corresponding integrated laser may widen the access to tunable ultrafast laser technology in biology and medicine.

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