A reliable source of coherent ns pulses of infrared radiation continuously tunable between 1.4 and 22 μm has been designed and built with the aim of developing a time-resolved infrared vibrational spectroscopy for species adsorbed on surfaces. The system is based on a Nd: YAG-laser and dye-laser combination which drive difference mixing processes in a sequence of nonlinear optical crystals (two LiNbO3, and a CdSe or AgGaS2). The system operates at MW peak power levels above 2500 cm−1, at kW power levels from 1000–2500 cm−1 and at 10–100 W levels down to 450 cm−1. These power levels are certainly sufficient for spectroscopic purposes, and at shorter wavelengths molecular pumping and applications requiring high-power should be possible. Vibrational spectra of a monolayer of CO adsorbed on Pt in an electrochemical cell have been obtained in an initial application of this source.
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Bethune, D.S., Luntz, A.C. A laser infrared source of nanosecond pulses tunable from 1.4 to 22 μm. Appl. Phys. B 40, 107–113 (1986). https://doi.org/10.1007/BF00694784