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High-Sensitivity High-Resolution Diode Laser Spectroscopy in the Near-Infrared Region.

Avetisov, Slava LU (1996) In Lund Reports in Atomic Physics LRAP-189.
Abstract
High-resolution spectroscopy measurements have been performed using near-infrared

diode lasers. Special emphasis was placed upon high accuracy absorption lineshape

measurements, which provide the basis for quantitative gas analysis. For this purpose,

relevant spectral characteristics of the radiation emitted by diode lasers were studied.

High-resolution measurements using newly developed long-wavelength GalnAsSb diode

lasers were demonstrated. The experimental technique utilised constant-current fast

wavelength scanning, which minimises effects of variations in the diode laser output

characteristics during a scan. The technique was combined with two-tone frequency

... (More)
High-resolution spectroscopy measurements have been performed using near-infrared

diode lasers. Special emphasis was placed upon high accuracy absorption lineshape

measurements, which provide the basis for quantitative gas analysis. For this purpose,

relevant spectral characteristics of the radiation emitted by diode lasers were studied.

High-resolution measurements using newly developed long-wavelength GalnAsSb diode

lasers were demonstrated. The experimental technique utilised constant-current fast

wavelength scanning, which minimises effects of variations in the diode laser output

characteristics during a scan. The technique was combined with two-tone frequency

modulation spectroscopy (TIFMS), which greatly improved measurement sensitivity. An

accurate theory of TIFMS lineshapes accounting for dispersion and nonlinear distortion

of the diode laser modulation-response was developed. The applicability of TIFMS for

accurate concentration and linewidth measurements was demonstrated. A least-squares

fitting procedure for retrieval of the spectral information from direct detection and

TIFMS lineshapes using the Voigt and collisionally narrowed profiles was developed.

Comparison of measurements using TIFMS and direct detection was performed, showing

the two to be in excellent agreement. The high accuracy achieved in spectral recordings,

and the rigorous treatment of TIFMS lineshapes, allowed quantitative measurements of

the collisional narrowing effect using weak absorptions. Pressure-induced broadening and

shift coefficients, and line strengths of molecular oxygen A-band transitions at 760 nm and

water vapor transitions at 1830 nm have been determined.

The experimental and retrieval techniques developed allow sensitive and accurate

measurements of gaseous species in a broad range of environments. (Less)
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keywords
Fysicumarkivet A:1996:Avetisov
in
Lund Reports in Atomic Physics
volume
LRAP-189
pages
196 pages
publisher
Lunds universitet, Avdelningen för atomfysik
defense location
n/a
defense date
1996-01-01 12:30
language
English
LU publication?
yes
id
b1937fe7-9d62-4ed9-b23f-3696e6a13636 (old id 2259954)
date added to LUP
2012-01-25 11:37:30
date last changed
2016-09-19 08:45:15
@misc{b1937fe7-9d62-4ed9-b23f-3696e6a13636,
  abstract     = {High-resolution spectroscopy measurements have been performed using near-infrared<br/><br>
diode lasers. Special emphasis was placed upon high accuracy absorption lineshape<br/><br>
measurements, which provide the basis for quantitative gas analysis. For this purpose,<br/><br>
relevant spectral characteristics of the radiation emitted by diode lasers were studied.<br/><br>
High-resolution measurements using newly developed long-wavelength GalnAsSb diode<br/><br>
lasers were demonstrated. The experimental technique utilised constant-current fast<br/><br>
wavelength scanning, which minimises effects of variations in the diode laser output<br/><br>
characteristics during a scan. The technique was combined with two-tone frequency<br/><br>
modulation spectroscopy (TIFMS), which greatly improved measurement sensitivity. An<br/><br>
accurate theory of TIFMS lineshapes accounting for dispersion and nonlinear distortion<br/><br>
of the diode laser modulation-response was developed. The applicability of TIFMS for<br/><br>
accurate concentration and linewidth measurements was demonstrated. A least-squares<br/><br>
fitting procedure for retrieval of the spectral information from direct detection and<br/><br>
TIFMS lineshapes using the Voigt and collisionally narrowed profiles was developed.<br/><br>
Comparison of measurements using TIFMS and direct detection was performed, showing<br/><br>
the two to be in excellent agreement. The high accuracy achieved in spectral recordings,<br/><br>
and the rigorous treatment of TIFMS lineshapes, allowed quantitative measurements of<br/><br>
the collisional narrowing effect using weak absorptions. Pressure-induced broadening and<br/><br>
shift coefficients, and line strengths of molecular oxygen A-band transitions at 760 nm and<br/><br>
water vapor transitions at 1830 nm have been determined.<br/><br>
The experimental and retrieval techniques developed allow sensitive and accurate<br/><br>
measurements of gaseous species in a broad range of environments.},
  author       = {Avetisov, Slava},
  keyword      = {Fysicumarkivet A:1996:Avetisov},
  language     = {eng},
  pages        = {196},
  publisher    = {ARRAY(0x9940d48)},
  series       = {Lund Reports in Atomic Physics},
  title        = {High-Sensitivity High-Resolution Diode Laser Spectroscopy in the Near-Infrared Region.},
  volume       = {LRAP-189},
  year         = {1996},
}