High-Power Mid-IR (4–5 μm) Femtosecond Laser System with a Broadband Amplifier Based on Fe~(2+):ZnSe

摘要

Concept of a solid-state femtosecond laser system with a multigigawatt power level in the 4–5 μm range has been proposed. The system contains an ultrashort pulse seeder, a two-stage chirped pulse amplifier based on a broadband Fe~(2+):ZnSe active element with optical pumping by a YSGG:Cr:Er laser, and an output stage that provides additional nonlinear optical compression of an amplified pulse to approximately 30 fs in a dielectric CaF_2 medium with anomalous group velocity dispersion in this spectral range.