Spectroscopy between 5 and 6 μm with a tunable spin-flip Raman source

R A Wood, R. B. Dennis, J. W. Smith

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19 Citations (Scopus)


We describe the application of a tunable, infrared, spin-flip Raman source to the measurement of the absorption spectra of gases in the spectral region 5-6 µm. Continuous tuning was obtained by using a low finesse Raman crystal cavity to eliminate mode pulling and hopping effects. The effects of atmospheric absorption, and pulse-to-pulse and magnetic field dependent intensity variations were cancelled by using a double beam arrangement. As an illustration of the operation of such a Raman spectrometer we obtain the P and Q branch absorption spectra of nitric oxide at various gas pressures in the spectral region 1890-1835 cm-1. Studies at low gas pressure and with the tunable source operating close to the threshold for stimulated emission show a resolution of ˜ 0.08 cm-1, determined by the linewidth of the Raman scattered radiation. This linewidth is shown to be in agreement with a mechanism of stimulated superradiant narrowing of the spontaneously scattered lineshape. © 1972.

Original languageEnglish
Pages (from-to)383-387
Number of pages5
JournalOptics Communications
Issue number6
Publication statusPublished - Feb 1972


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