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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Tunable diode laser spectroscopy using the IBM PC (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2493-2498 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes a dual-beam, tunable diode laser (TDL) spectrometer built for gas-phase vibrational spectroscopy studies. It employs a commercially available cryogenic cooler and control electronics and can incorporate Pb-salt diode lasers with operating wavelengths from 7 to 12 μm. The instrument optics have been largely assembled using inexpensive reflecting components. An IBM personal computer with enhanced graphics and high-speed data-acquisition unit permits dual-channel sweep averaging (normally done with expensive, commercial hard-wired units) as well as on-line spectral line parameter calculations. Such an arrangement puts this type of laser spectroscopy capability within reach of undergraduate physics and chemistry programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139099
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Tunable diode laser spectroscopy using the IBM PC (1986)
    American Institute of Physics
    Details
    Publication Date: 1986-10-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Laser heterodyne spectrometer for helioseismology (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The technique of laser heterodyne spectroscopy has been applied to the measurement of solar oscillations. Coherent mixing of solar radiation with the output of a frequency-stabilized CO2 laser permits the measurement of fully resolved profiles of solar absorption lines with high spectral purity and excellent frequency stability. This technique has been used to measure OH pure rotation lines in the infrared solar spectrum. Power spectra of these line frequency measurements show the well-known 5-min oscillations as well as significant velocity power at shorter periods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 25; 58-62
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Infrared helioseismology - Detection of the chromospheric mode (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Time-series observations of an infrared solar OH absorption line profile have been obtained on two consecutive days using a laser heterodyne spectrometer to view a 2 arcsec portion of the quiet sun at disk center. A power spectrum of the line center velocity shows the well-known photospheric p-mode oscillations very prominently, but also shows a second feature near 4.3 mHz. A power spectrum of the line intensity shows only the 4.3 mHz feature, which is identified as the fundamental p-mode resonance of the solar chromosphere. The frequency of the mode is observed to be in substantial agreement with the eigenfrequency of current chromospheric models. A time series of two beam difference measurements shows that the mode is present only for horizontal wavelengths greater than 19 Mm. The period of a chromospheric p-mode resonance is directly related to the sound travel time across the chromosphere, which depends on the chromospheric temperature and geometric height. Thus, detection of this resonance will provide an important new constraint on chromospheric models.
    Keywords: SOLAR PHYSICS
    Type: Nature (ISSN 0028-0836); 322; 232-234
    Format: text
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    NASA TECHNICAL REPORTS
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