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Proceedings Paper

Tunable Diode Laser Heterodyne Spectrometer For Remote Observations Near 8 µm
Author(s): D. A. Glenar; T. Kostiuk; D. E. Jennings; D. Buhl; M. J. Mumma
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Paper Abstract

An ultra-high resolution diode laser heterodyne spectrometer for observational and laboratory use has been developed for operation between 7.5 and 8.5 microns. The local oscillator is a PbSe tuneable diode laser kept continuously at operating temperatures of 12-60 K using a closed-cycle cooler. The laser output frequency is controlled and stabilized using a high-precision diode current supply, constant temperature controller, and a shock isolator mounted between the refrigerator cold tip and the diode mount. Reflecting optics are used whenever possible to minimize losses from internal reflection and absorption, and to eliminate chromatic effects. The spectrometer is used with a 64-channel RF spectral line receiver for a resolving power of 1.5 X 10° and an IF coverage of 1600 MHz. Heterodyne observations of the sunspot spectrum near 1200 cm1 have revealed fully resolved absorption features in the v = 1-0 and v = 2-1 rotation-vibration bands of silicon monoxide. The instrument has also been used for continuum observations of the infrared object IRC+10-216 as well as for measurements of terrestrial N2O, 03 and CH4.

Paper Details

Date Published: 16 November 1982
PDF: 11 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933456
Show Author Affiliations
D. A. Glenar, Colgate University (United States)
T. Kostiuk, NASA/Goddard Space Flight Center (United States)
D. E. Jennings, NASA/Goddard Space Flight Center (United States)
D. Buhl, NASA/Goddard Space Flight Center (United States)
M. J. Mumma, NASA/Goddard Space Flight Center (United States)


Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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