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Applied Optics

Applied Optics


  • Vol. 37, Iss. 24 — Aug. 20, 1998
  • pp: 5771–5776

High-sensitivity mid-infrared heterodyne spectrometer with a tunable diode laser as a local oscillator

Frank Schmülling, Bärbel Klumb, Markus Harter, Rudolf Schieder, Bernd Vowinkel, and Gisbert Winnewisser  »View Author Affiliations

Applied Optics, Vol. 37, Issue 24, pp. 5771-5776 (1998)

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A new mid-IR heterodyne spectrometer, which is intended to be applied for atmospheric and astrophysical studies, is presented. The spectrometer uses a frequency-stabilized tunable diode laser as a local oscillator. Owing to the low output power of available single-mode diode lasers, a newly developed confocal-ring resonator, the diplexer, is used to superimpose the source signal efficiently with that of the local oscillator. Additionally, the diplexer serves as an optical filter that establishes controlled optical feedback between the laser diode and the detector, which allows stable laser operation with linewidths of the order of 1 MHz. The heterodyne signal from the HgCdTe detector is analyzed by means of a 1.4-GHz acousto-optical spectrometer. With this setup we find system temperatures as low as 4400 K (double sideband), that is, approximately a factor of 6 of the quantum limit.

© 1998 Optical Society of America

OCIS Codes
(300.0300) Spectroscopy : Spectroscopy
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: October 16, 1997
Revised Manuscript: April 23, 1998
Published: August 20, 1998

Frank Schmülling, Bärbel Klumb, Markus Harter, Rudolf Schieder, Bernd Vowinkel, and Gisbert Winnewisser, "High-sensitivity mid-infrared heterodyne spectrometer with a tunable diode laser as a local oscillator," Appl. Opt. 37, 5771-5776 (1998)

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