On the possibility of developing quasi-CW high-power high-pressure laser on 4p–4s transition of ArI with electron beam—optical pumping: quenching of 4s (3P2) lower laser level. (23rd November 2017)

• Record Type: Journal Article
• Authors: Ionin, A A; Kholin, I V; Yu L'dov, A; Seleznev, L V; Ustinovskii, N N; Zayarnyi, D A
• Is Part Of: Laser physics. Volume 27:Number 12(2017:Dec.)
• Publication Date: 2017-11-23
• Subjects: rare gases -- helium -- argon -- plasma chemistry -- collisional quenching of atomic states -- absorption probing; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/aa92fa
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: A new electron beam-optical procedure is proposed for quasi-cw pumping of high-pressure large-volume He–Ar laser on the 4p[1/2]1 – 4 s [ 3 / 2 ] 2 0 argon atom transition at the wavelength of 912.5 nm. It consists of creation and maintenance of a necessary density of the 4 s [ 3 / 2 ] 2 0 metastable state in the gain medium by a fast electron beam and subsequent optical pumping of the upper laser level via the classical three-level scheme using a laser diode. Absorption probing is used to study collisional quenching of Ar * metastable in electron-beam-excited high-pressure He–Ar mixtures with a low content of argon. The rate constants for plasma-chemical reactions Ar * + He + Ar > A r 2 ∗ + He (3.6 ± 0.4) × 10 −33 cm 6 s −1, Ar * + 2He > HeAr * + He (4.4 ± 0.9) × 10 −36 cm 6 s −1 and Ar * + He > Products + He (2.4 ± 0.3) × 10 −15 cm 3 s −1 were for the first time measured.