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  • LASERS AND MASERS  (4)
  • laser frequencies  (3)
  • J31
  • 1
    Electronic Resource
    Electronic Resource
    Optically-Pumped Far-Infrared Laser Lines in Hydrazine, Methanol, Heavy Water, and Ammonia: New Laser Lines and Frequency Measurements (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 725-730 
    Details
    ISSN: 1572-9559
    Keywords: hydrazine ; methanol ; heavy water ; ammonia ; new far-infrared laser lines ; optically pumped far-infrared laser ; laser frequencies ; relative intensity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A far-infrared laser cavity designed to favor short-wavelength laser lines was used to generate optically-pumped far-infrared laser radiation. New far-infrared laser lines were discovered in hydrazine, heavy water, ammonia, and several short-wavelength lines previously discovered in methanol were observed. Wavelength, frequency, and relative intensity measurements were performed on laser lines in the wavelength range 42.4 to 253.7 μm. Each far-infrared frequency measurement was obtained by mixing the far-infrared radiation with radiation from two reference CO2 lasers and from a microwave synthesizer in a metal-insulator-metal diode. The pump laser was a high-Q Fabry Perot resonator oscillating on 275 grating-selected laser lines including regular, sequence, and hot band lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026456425454
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optically-Pumped Far-Infrared Laser Lines of Methanol Isotopomers: 12CH3OH, 12CH3OD, and 12CH2DOH (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 731-737 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OH ; 12CH3OD ; 12CH2DOH ; new far-infrared laser lines ; optically-pumped far-infrared laser ; laser frequencies ; relative intensity ; relative polarization ; pump-frequency offset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-seven new far-infrared laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically-pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2-m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026408509524
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optically Pumped Far-Infrared Laser Lines of Methanol Isotopomers: 12CD3OH, 12CH3OD, and 12CH2DOH (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 477-483 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OH ; 12CH3OD ; 12CH2DOH ; new far-infrared laser lines ; optically pumped far-infrared laser ; laser frequencies ; relative intensity ; relative polarization ; pump-frequency offset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-seven new FIR, far-infrared, laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2 m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006667300438
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  • 4
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    NO2 heterodyne frequency measurements with a tunable diode laser, a CO laser transfer oscillator and CO2 laser standards (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Heterodyne frequency measurements have been made on selected groups of nitrogen dioxide rovibronic transitions between 1580.8 and 1650.7/cm. The groups are separated by 7 to 10/cm, and the intent is to provide a limited (and interim) calibration table for the region. In addition to a table of measured frequencies in the region, figures of spectra in the vicinity of the measured lines are included to provide a map for identifying the transitions measured.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-182393 , NAS 1.26:182393 , PB88-110051 , NBS/TN-1308
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Far infrared laser frequencies of CH3OD and N2H4 (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The frequencies of 26 laser lines with wavelengths between 57 and 534 microns are measured in the optically pumped laser gases CH3OD and N2H4. A pair of 12CO2 lasers are employed as a frequency standard for the heterodyne frequency measurements. As the measurements are oriented toward spectroscopic applications of FIR lasers where dense, broad, frequency coverage is essential, every strong pump absorption of the two molecules for new lines that might be made to lase by varying the laser gas pressure and the tuning of the pump laser are investigated.
    Keywords: LASERS AND MASERS
    Type: International Journal of Infrared and Millimeter Waves (ISSN 0195-9271); 12; 1161-116
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Accurate frequency of the 119 micron methanol laser from tunable far-infrared absorption spectroscopy (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: High-accuracy absorption spectroscopy of CH3OH in the far infrared is discussed. In addition to 22 transitions in the ground state, the frequency of the (n, tau, J, K), (0, 1, 16, 8) to (0, 2, 15, 7) transition in the nu5 excited vibrational level, which is responsible for the laser emission at 119 microns, was measured. The measured frequency is 2,522,782.57(10) MHz at zero pressure, with a pressure shift of 6.1(32) kHz/Pa (0.805/420/ MHz/torr). An accurate remeasurement of the laser emission frequency has also been performed, and the results are in good agreement.
    Keywords: LASERS AND MASERS
    Type: IEEE Journal of Quantum Electronics (ISSN 0018-9197); 26; 575-579
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Sub-Doppler tunable far-infrared spectroscopy (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The first experimental observations of sub-Doppler linewidths in a cell made using tunable far-infrared radiation are reported. A double-resonance scheme has been used, combining CO2-laser infrared radiation with tunable far-infrared radiation to observe a sub-Doppler line shape in an excited vibrational state of CH3OH.
    Keywords: LASERS AND MASERS
    Type: Optics Letters (ISSN 0146-9592); 12; 867-869
    Format: text
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    NASA TECHNICAL REPORTS
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