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  • 1
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    Digital control of diode laser for atmospheric spectroscopy (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A system is described for remote absorption spectroscopy of trace species using a diode laser tunable over a useful spectral region of 50 to 200 cm(-1) by control of diode laser temperature over range from 15 K to 100 K, and tunable over a smaller region of typically 0.1 to 10 cm(-1) by control of the diode laser current over a range from 0 to 2 amps. Diode laser temperature and current set points are transmitted to the instrument in digital form and stored in memory for retrieval under control of a microprocessor during measurements. The laser diode current is determined by a digital to analog converter through a field effect transistor for a high degree of ambient temperature stability, while the laser diode temperature is determined by set points entered into a digital to analog converter under control of the microprocessor. Temperature of the laser diode is sensed by a sensor diode to provide negative feedback to the temperature control circuit that responds to the temperature control digital to analog converter.
    Keywords: LASERS AND MASERS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Precise Control of a Tunable IR Diode Laser (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Tuning system applicable to lead-salt semiconductor tunable diode laser (TDL) and other solid-state lasers with temperature and current dependent emission wavelength developed for balloon borne, highresolution spectrometer that measures trace atmospheric constituents in stratosphere. Instrument measures absorption at approximately 20 points in 100 MHz wide spectral line.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16000 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 326
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Balloon-borne laser heterodyne radiometer for measurements of stratospheric trace species (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A laser heterodyne radiometer has been flown to measure chlorine monoxide in the stratosphere, which has an important role in the catalytic destruction of ozone. The measured values in the 35-38 km region are found to be significantly higher than model predictions, and the drop-off at lower altitudes occurs at a higher rate, even after adjusting the profile to include the solar zenith angle effects.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 20; Feb. 15
    Format: text
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    NASA TECHNICAL REPORTS
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