Abstract
Lasing action was observed on the 3d4p 1F30→4s3d 1D2 and 4p2 1D2→4s4p 1P10 atomic transitions in calcium at 535 and 586 nm, respectively, when mixtures of atomic calcium and an inert gas were irradiated by a focused KrF laser (249 nm). No lasing was observed when the inert-gas collision partner was absent. The upper laser levels in these systems are not optically connected to the 1S0 ground state and thereby may be accessed via transitions in the inert-gas/calcium quasimolecule by absorption of KrF laser light in the wings of the 4s2 1S0 to 4s6p 1P10 calcium 2398.56-Å resonance transition (collision-induced absorption). The pump laser was a modified Tachisto using unstable cavity optics which provided focused intensities of nearly 1 GW/cm2. The calcium was produced in a stainless-steel heat pipe oven at temperatures near 1200 °K. Buffer gases studied include He, Ar, and Kr.
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