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Stimulated anti-Stokes emission at 457.6 nm accompanying the transition from the 3 D 2 metastable to the 1 S 0 ground state in barium has been observed when the output of a dye laser is tuned close to the intercombination line at 791.1 nm. The emission is interpreted as parametric four-wave coupling. Scattering at other frequencies is also observed and the possibility of using this process to produce tunable ultraviolet light is briefly discussed.
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Carlsten et al. (1973) studied this question.
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