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A new electron beam-optical procedure is proposed for quasi-cw pumping ofhigh-pressure large-volume He-Ar laser on 4p[1/2]1 - 4s[3/2]2 argon atomtransition at the wavelength of 912.5 nm. It consists of creation andmaintenance of a necessary density of 4s[3/2]2 metastable state in the gainmedium by a fast electron beam and subsequent optically pumping of the upperlaser level via the classical three-level scheme using a laser diode.Absorption probing is used to study collisional quenching of Ar* metastable inelectron-beam-excited high-pressure He-Ar mixtures with a low content of argon.The rate constants for plasma-chemical reactions Ar*+He+Ar-Ar2*+He (3.6 +-0.4)x10-33 cm6/s, Ar+2He-HeAr*+He (4.4 +- 0.9)x10-36 cm6/s andAr*+He-Products+He (2.4 +- 0.3)x10-15 cm3/s are for the first time measured.

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