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  • 1
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    High resolution spectral measurement of the HNO3 11.3-micron band using tunable diode lasers (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: High resolution spectra in the region of the 2-nu9 band of nitric acid have been obtained for selected portions of the HNO3 spectrum using tunable diode laser techniques. Continuous spectra are presented from 891.25/cm to 898.77/cm, with a spectral resolution less than or equal to 0.001/cm (30 MHz). Absolute line intensities and line positions are presented. Absolute wavelength calibration was obtained by frequency mixing the diode laser with a C(13)O2(16) isotope laser. Self and foreign gas (N2) broadening coefficients were iteratively calculated from the experimental data and were determined.
    Keywords: LASERS AND MASERS
    Type: Applied Optics; 17; Jan. 1
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  • 2
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    High resolution infrared spectra of atmospheric trace gases (1980)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 134
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  • 3
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    High-resolution spectral measurements of SO2 from 1176.0 to 1265.8 reciprocal cm using a single PbSe laser with magnetic and current tuning (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: ENVIRONMENT POLLUTION
    Type: IEEE Journal of Quantum Electronics; QE-11; May 1975
    Format: text
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  • 4
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    Measurement of HCl absorption coefficients with a DF laser (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Absorption coefficients in the fundamental P-branch of HCl at several DF laser transitions from 2439.02/cm to 2862.87/cm have been measured experimentally. The 2-1 P(3) DF laser transition has been shown to overlap the P(6) HCl-37 absorption line within the halfwidth of an atmospherically broadened line. The absorption coefficient k was measured to be 5.64 plus or minus 0.28/(atm-cm) for a 0.27% mixture of HCl in N2 at a total pressure of 760 torr. A theoretical and experimental comparison of the pressure dependence of k showed that the 2-1 P(3) DF transition lies 1.32 plus or minus 0.15 GHz from the center of the P(6) HCl absorption line. Applications of these results to differential absorption lidar and to heterodyne detection are discussed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Applied Optics; 16; Jan. 197
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  • 5
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    CO2 DIAL sensitivity studies for measurements of atmospheric trace gases (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: An analysis is presented of the accuracy of infrared differential absorption lidar (DIAL) measurements of trace constituents in the atmosphere. Expressions are derived for the signal-to-noise ratios applicable in the detection of a signal from a scattering cell for the cases of single-detection heterodyne detection and direct detection. Results of computer simulations of the expectation value of the measured return for various measurement conditions are presented which illustrate the sensitivities of plume measurements for horizontal range-resolved and vertical content measurements of NH3 in heterodyne and direct detection. Advantages for long-range measurements of the use of rare isotope laser frequencies, tuning by collision broadening, and closely spaced on and off frequencies are pointed out.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    Infrared vibration-rotation spectra of the ClO radical using tunable diode laser spectroscopy (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Tunable diode laser spectroscopy is used to measure the infrared vibration-rotation spectra of the ClO radical. The radical is generated in a flow system where a Cl2-He mixture passes through a microwave discharge to dissociate the Cl2. An O3-O2 mixture from an ozone generator is injected into the system downstream of the microwave discharge where O3 combines with Cl to form ClO. By adjusting the gas flow rates to yield an excess of Cl atoms, all the ozone is combined. ClO concentration is measured with UV absorption at 2577 and 2772 A and a deuterium lamp as a continuous source. Total cell pressure is 5.5 torr. The diode laser spectrometer is calibrated with ammonia lines as a reference where possible. The frequency of vibration-rotation lines is expressed as a function of rotational quantum number, fundamental vibrational frequency, and the rotational constants of the upper and lower vibrational states.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Applied Optics; 17; May 1
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  • 7
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    High resolution absorption coefficients for Freon-12 (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The ultra high resolution absorption coefficients of the Q-branch of Freon-12 obtained with tunable diode laser spectroscopy are presented. Continuous spectra are presented from 1155/cm to 1163/cm, and absolute wavelength calibration was obtained using SO2 spectra as a standard and a 5 cm Ge etalon for relative calibration between SO2 lines. The Freon-12 data obtained at a pressure of 0.05 torr showed a rich and highly structured spectra, but with the exception of three isolated features, collisional broadening reduces the spectra to a structureless continuum for nitrogen pressures greater than 20 torr. The spectra at 1161/cm continue to exhibit structure at atmospheric pressure.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Geophysical Research Letters; 6; Nov. 197
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  • 8
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    High-resolution spectral measurement of the HNO3 5.9-micron band using a tunable diode laser (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: High resolution spectra in the region of the v(2) band of nitric acid have been obtained for selected portions of the HNO3 spectrum using tunable diode laser techniques. Continuous spectra are presented from 1718.97/cm to 1729.57/cm, with a spectral resolution not greater than 0.001/cm (30 MHz). Absolute line intensities and line positions are presented. Self- and foreign-gas (N2) broadening coefficients were iteratively calculated from the experimental data and were determined to be alpha(a) = 0.74/cm atm and alpha (f) = 0.13/cm atm, respectively.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Applied Optics; 18; Dec. 15
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  • 9
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    DIAL with heterodyne detection including speckle noise: Aircraft/shuttle measurements of O3, H2O, and NH3 with pulsed tunable CO2lasers (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A parametric analysis of DIAL sensitivity with heterodyne detection is presented and comparisons with direct detection are discussed. Examples are given for monitoring vertical distributions of O3, H2O, and NH3 using a ground-, aircraft-, or shuttle-based pulsed tunable CO2 laser DIAL system. Results indicate that maximum sensitivity at minimum laser energy per measurement requires multiple pulse operation with the energy per pulse selected so that the measured photon rate is approximately equal to the detector IF bandwidth. Measurement sensitivities can be maximized and interference effects minimized by fine adjustment of measurement frequencies using the tunability of high pressure lasers. The use of rare isotope lasers minimizes loss due to CO2 atmospheric absorption.
    Keywords: LASERS AND MASERS
    Type: Heterodyne Systems and Technol., Pt. 2; p 557-567
    Format: application/pdf
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  • 10
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    Recent advances in efficient long-life, eye-safe solid state and CO2 lasers for laser radar applications (1989)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: The key problems in the development of eye-safe solid-state lasers are discussed, taking into account the energy transfer mechanisms between the complicated energy level manifolds of the Tm, Ho, Er ion dopants in hosts with decreasing crystal fields such as YAG or YLF. Optimization of energy transfer for efficient lasing through choice of dopant concentration, power density, crystal field and temperature is addressed. The tailoring of energy transfer times to provide efficient energy extraction for short pulses used in DIAL and Doppler lidar is considered. Recent advances in Pt/SnO2 oxide catalysts and other noble metal/metal oxide combinations for CO2 lasers are discussed. Emphasis is given to the dramatic effects of small quantities of H2O vapor for increasing the activity and lifetime of Pt/SnO2 catalysts and to increased lifetime operation with rare isotope (C-12)(O-18)2 lasing mixtures.
    Keywords: LASERS AND MASERS
    Type: Laser Radar III; Sept. 6-7, 1988; Boston, MA; United States
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