title: High-power femtosecond Raman frequency shifter.
abstract: We report on the generation of broadband, high-energy femtosecond pulses centered at 1.28 μm by stimulated Raman scattering in a pressurized hydrogen cell. Stimulated Raman scattering is performed by two chirped and delayed pulses originating from a multi-mJ Ti:sapphire amplifier. The Stokes pulse carries record-high energy of 4.4 mJ and is recompressed down to 66 fs by a reflective grating pair. We characterized the short-wavelength mid-infrared source in view of energy stability, beam profile, and conversion efficiency at repetition rates of 100 and 10 Hz. The demonstrated high-energy frequency shifter will benefit intense THz sources based on highly nonlinear organic crystals.
authors.forename: Carlo
authors.initials: C
authors.lastname: Vicario
authors.forename: Mostafa
authors.initials: M
authors.lastname: Shalaby
authors.forename: Aleksandr
authors.initials: A
authors.lastname: Konyashchenko
authors.forename: Leonid
authors.initials: L
authors.lastname: Losev
authors.forename: Christoph P
authors.initials: CP
authors.lastname: Hauri