Femtosecond filament-driven mid-IR lasing under plasma–chemical reaction in high-pressure mixture SF₆ -H₂ –Ar

Abstract

A scheme of plasma-chemical mid-IR hydrogen fluoride (HF) lasing is proposed, in which electrons of femtosecond filament are produced in argon and give rise to a chain of plasma-chemical reactions occurring with SF 6 and H 2 added to the argon bath and resulting in the formation of vibrationally excited HF molecules. The conditions for the occurrence of amplified spontaneous emission and lasing in the range of 2.7-3 µm in a selected gas mixture at a total pressure of several atmospheres can be realized under the action of a femtosecond laser on Cr-forsterite with a wavelength of 1.24 µm. In numerical experiments, it was demonstrated that HF lasing energy at the level of 1.5 µJ are achievable for typical monofilament plasma parameters.

Spin-polarized proton acceleration by an intense laser pulse with a foil-gas target

“…Recently, with the remarkable development of laser technology and the new technique of producing prepolarized gas targets by photodissociation [5][6][7], some schemes have * Author to whom any correspondence should be addressed. been proposed to generate polarized proton beams by driving lasers.…”