The first reported use of a rhodamine-dye laser to generate tunable high-power picosecond pulses in the vibrational infrared is described. By using stimulated electronic Raman scattering from the 6s–5d transition in a superheated cesium vapor, we have shifted 1-psec pulses from an amplified rhodamine-dye laser (568–590 nm) to 3040–2320 cm−1 (3.3–4.3 μm). Somewhat longer pulses have been shifted to 1950 cm−1 (5.1 μm). Peak infrared energies of 11 μJ representing a quantum efficiency of 4.6%, were obtained at a 10-Hz repetition rate. Tuning to longer wavelengths with short pulses is limited by nonlinear processes but should be possible by further reductions of cesium dimer effects.
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