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

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

Research output: Contribution to journalArticle

Abstract

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
Volume4
Issue number6
Publication statusPublished - Feb 1972

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gas pressure
absorption spectra
atmospheric attenuation
pulling
nitric oxide
pulses
stimulated emission
spectroscopy
low pressure
tuning
spectrometers
cavities
thresholds
radiation
gases
magnetic fields
crystals

Cite this

Wood, R. A., Dennis, R. B., & Smith, J. W. (1972). Spectroscopy between 5 and 6 μm with a tunable spin-flip Raman source. Optics Communications, 4(6), 383-387.
Wood, R A ; Dennis, R. B. ; Smith, J. W. / Spectroscopy between 5 and 6 μm with a tunable spin-flip Raman source. In: Optics Communications. 1972 ; Vol. 4, No. 6. pp. 383-387.
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Wood, RA, Dennis, RB & Smith, JW 1972, 'Spectroscopy between 5 and 6 μm with a tunable spin-flip Raman source', Optics Communications, vol. 4, no. 6, pp. 383-387.

Spectroscopy between 5 and 6 μm with a tunable spin-flip Raman source. / Wood, R A; Dennis, R. B.; Smith, J. W.

In: Optics Communications, Vol. 4, No. 6, 02.1972, p. 383-387.

Research output: Contribution to journalArticle

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AU - Smith, J. W.

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N2 - 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.

AB - 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.

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