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Optics Letters

Optics Letters

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  • Vol. 26, Iss. 9 — May. 1, 2001
  • pp: 641–643

Ultrahigh-resolution spectrometer for the 5-µm wavelength region

P. Palm, D. Hanke, W. Urban, and M. Mürtz  »View Author Affiliations


Optics Letters, Vol. 26, Issue 9, pp. 641-643 (2001)
http://dx.doi.org/10.1364/OL.26.000641


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Abstract

We present an ultrahigh-resolution saturation spectrometer based on a line-tunable carbon monoxide laser near 60 THz (λ = 5 µm). A spectral resolution of 14 kHz (Δν/ν = 2.3 × 10-10) for CO fundamental-band transitions was achieved, which improves on earlier results by one order of magnitude. A frequency-locking scheme using tunable microwave sidebands provides tunability and absolute frequency control of the CO laser on the kilohertz. Transit-time broadening and pressure broadening of the observed transitions are significantly reduced by use of expanded laser beams in a 24-m absorption cell at pressures down to 0.0 1Pa. The new spectrometer is suitable for the study of saturation line shapes and the development of a new generation of frequency standards in the 60-THz region.

© 2001 Optical Society of America

OCIS Codes
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6460) Spectroscopy : Spectroscopy, saturation

Citation
P. Palm, D. Hanke, W. Urban, and M. Mürtz, "Ultrahigh-resolution spectrometer for the 5-µm wavelength region," Opt. Lett. 26, 641-643 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-9-641

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