Nonlinear Optics in Guided Geometries - Abstract

Babushkin, Ihar

Optical amplification by four-wave mixing in gases using quasi-phase-matching with ultrasound waves

Quasi-phase-matching in periodically pooled Xi⁽²⁾ crystals is limited by their transparency range and material damage. We propose a novel scheme of quasi-phase matching of four-wave mixing (FWM) in gases in waveguides or in bulk, based on a periodical modulation of the pressure in an Xi⁽³⁾ gas, which is created by a standing ultrasound wave in the direction of light propagation. Nobel gases have no rotational and vibrational absorption bands at low frequencies and therefore possess an extremely broad transparency range up to vacuum ultraviolet. We calculate the amplified signal pulse by FWM and study the conditions of optimal amplification and quasi-phase matching. The achievable signal frequency range is limited by the ultrasound absorption.