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Optics Letters

Optics Letters


  • 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)

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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

P. Palm, D. Hanke, W. Urban, and M. Mürtz, "Ultrahigh-resolution spectrometer for the 5-µm wavelength region," Opt. Lett. 26, 641-643 (2001)

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  1. V. Bernard, C. Daussy, and C. Chardonnet, IEEE J. Quant. Electron. 33, 1282 (1997).
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  4. M. H. Wappelhorst, M. Mürtz, P. Palm, and W. Urban, Appl. Phys. B 65, 25 (1997).
  5. B. Meyer, S. Saupe, M. H. Wappelhorst, T. George, F. Kühnemann, M. Schneider, M. Havenith, W. Urban, and J. Legrand, Appl. Phys. B 61, 169 (1995).
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