A multi-milliJoule femtosecond Raman laser emitting at 1.28 um

TL;DR

This paper demonstrates a high-energy femtosecond Raman laser at 1.28 um using stimulated Raman scattering in pressurized hydrogen, achieving 4.4 mJ pulses compressed to 66 fs, suitable for THz applications.

Contribution

First demonstration of a multi-milliJoule femtosecond Raman laser at 1.28 um with high energy and short pulse duration using pressurized hydrogen.

Findings

Generated 4.4 mJ pulses at 1.28 um

Pulse duration compressed to 66 fs

Stable energy and beam profile at 100 Hz

Abstract

We report on the generation of broadband, high-energy femtosecond pulses centered at 1.28 um by stimulated Raman scattering in 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 energy of 4.4 mJ and is recompressed down to 66 fs by reflective grating pair. We characterized the short-wavelength mid-infrared source in view of energy stability, beam profile and conversion efficiency at a repetition rate of 100 Hz and 10 Hz. The demonstrated laser will benefit intense THz generation applications from highly nonlinear organic crystals.