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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4635–4638

Use of a Fabry–Perot interferometer to isolate pure rotational Raman spectra of diatomic molecules

Yuri Arshinov and Sergey Bobrovnikov  »View Author Affiliations


Applied Optics, Vol. 38, Issue 21, pp. 4635-4638 (1999)
http://dx.doi.org/10.1364/AO.38.004635


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Abstract

We propose to use a Fabry–Perot interferometer (FPI) as a comb frequency filter to isolate pure rotational Raman spectra (PRRS) of nitrogen molecules. In making the FPI’s free spectral range equal to the spectral spacing between the lines of nitrogen PRRS, which are practically equidistant, one obtains a device with a comb transmission function with the same period. However, to match the FPI transmission comb completely with the comb of nitrogen PRRS lines one should tune the wavelength of the radiation used to excite the PRRS of nitrogen exactly to the position of any minimum in the FPI transmission comb. Thus to achieve this task for the case of nitrogen PRRS one must take the FPI’s free spectral range Δν f = 4BN2 and the wavelength of the exciting radiation such that (1/λexc) = 4BN2 (k + 1/2), where BN2 is the rotational constant of the nitrogen molecule and k is an arbitrary integer number. In this case all (odd and even) pure rotational Raman lines of nitrogen will pass through the FPI while the line of exciting radiation is being suppressed. Additionally, a FPI cuts out the spectrally continuous sky background light from the spectral gaps between the PRRS lines.

© 1999 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.3640) Remote sensing and sensors : Lidar
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman

History
Original Manuscript: December 7, 1998
Revised Manuscript: March 22, 1999
Published: July 20, 1999

Citation
Yuri Arshinov and Sergey Bobrovnikov, "Use of a Fabry–Perot interferometer to isolate pure rotational Raman spectra of diatomic molecules," Appl. Opt. 38, 4635-4638 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4635

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