Amplified spontaneous emission over the XeF(D→X) transition in solid Kr

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Abstract
XeF doped solid Kr represents a novel solid state exciplex laser. A net gain in excess of 100 cm−1 and a superradiant beam of 5 mrad divergence are observed over the XeF(D→X) transition at 301 nm, when free standing crystals of XeF doped Kr are optically pumped near the XeF(D←X) absorption maximum at 260 nm. Superlinear dependence of gain on pump intensity and low divergence of the amplified beam are taken as evidence for self‐focusing. The XeF(D) state is effectively isolated from the lower manifold of charge transfer states in solid Kr, which includes XeF(B,C) and (KrXe)+F−.

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