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Excited-State absorption in cadmium iodide and mercury halide laser discharges

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Abstract

Although the lowest lying ion pair states of the Column IIB metal-halide molecules have been well studied in emission, little is known of the more highly excited electronic states. This paper describes the observation of visible and UV absorption bands in cadmium monoiodide (Cdl) and mercury bromide (HgBr) in which the initial state is the laser’s upper level (B2Σ). In each case, the band terminates on a covalent state that correlates with an excited metal atom (in the lowest-lying 3P manifold) and a ground-state halogen atom. Such bands are certain to exist for the rare gas halide (RGH) molecules as well as it was recognized1 soon after discovery of the RGH lasers that these absorptions (although not previously observed) could represent a serious loss channel.

© 1985 Optical Society of America

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