Abstract

Self-phase-modulation-enabled spectral selection (SESS) allows generation of widely tunable femtosecond pulses. We propose pre-chirp managed SESS, in which the excitation pulse is properly pre-chirped to control the fiber-optic nonlinear spectral broadening and hence generate separated spectral lobes—a feature demanded by SESS. Besides offering improved efficiency compared with conventional energy-tuned SESS, this new method is able to reshape an input pulse of unwanted shape into a bell-shaped pulse that is desired for implementing SESS. The excellent energy scalability of pre-chirp managed SESS can produce megawatt-level femtosecond pulses widely tunable in the wavelength range of 0.86–1.3 µm. Such a powerful source is well suited to drive multiphoton microscopy to achieve deep-tissue imaging.

© 2020 Optical Society of America

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