Lasing due to ionic transitions of strontium in a discharge with an electron beam

Lasing was obtained due to the λ = 430.5-nm Sr II transition in an He–Sr mixture pumped by the recombination of Sr²⁺ ions in a transverse open discharge coaxial with an electron beam. Lasing due to Sr II transitions in an He–Kr–Sr mixture was realized simultaneously for three types of pumping: electron impact (λ = 1033 and 1092 nm), charge transfer (λ = 1087, 1123, and 1202 nm), and recombination (λ = 430.5 nm) pumping.