Influence of laser intensity on absorption line broadening in laser absorption spectroscopy

2006 ◽  
Vol 100 (6) ◽  
pp. 063102 ◽  
Author(s):  
Makoto Matsui ◽  
Kimiya Komurasaki ◽  
Satoshi Ogawa ◽  
Yoshihiro Arakawa
Keyword(s):  
Absorption Line ◽  
Absorption Spectroscopy ◽  
Laser Intensity ◽  
Line Broadening ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption

scholarly journals Diode-Laser Induced Fluorescence Spectroscopy of an Optically Thick Plasma in Combination with Laser Absorption Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
S. Nomura ◽  
T. Kaneko ◽  
G. Ito ◽  
K. Komurasaki ◽  
Y. Arakawa
Keyword(s):  
Absorption Spectroscopy ◽  
Laser Intensity ◽  
Argon Plasma ◽  
Laser Induced Fluorescence ◽  
Probe Laser ◽  
Abel Inversion ◽  
Measurement Point ◽  
Laser Absorption Spectroscopy ◽  
Saturated Absorption ◽  
Laser Absorption

Distortion of laser-induced fluorescence profiles attributable to optical absorption and saturation broadening was corrected in combination with laser absorption spectroscopy in argon plasma flow. At high probe-laser intensity, saturated absorption profiles were measured to correct probe-laser absorption. At low laser intensity, nonsaturated absorption profiles were measured to correct fluorescence reabsorption. Saturation broadening at the measurement point was corrected using a ratio of saturated to non-saturated broadening. Observed LIF broadening and corresponding translational temperature without correction were, respectively,2.20±0.05 GHz and2510±100 K and corrected broadening and temperature were, respectively,1.96±0.07 GHz and1990±150 K. Although this correction is applicable only at the center of symmetry, the deduced temperature agreed well with that obtained by LAS with Abel inversion.

Tunable Diode Laser Absorption Spectroscopy of the Pyrolysis of Methylsilazane

1991 ◽  
Vol 250 ◽  
Author(s):  
H. C. Sun ◽  
Y. W. Bae ◽  
E. A. Whittaker ◽  
B. Gallois
Keyword(s):  
Absorption Line ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Chemical Vapor ◽  
Decomposition Temperature ◽  
Tunable Diode Laser ◽  
Bond Rupture ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

AbstractAn understanding of the chemical processes occurring in the gas phase during metalorganic chemical vapor deposition is needed to design novel precursors and for the subsequent control of the composition and the microstructure of the solid product. Tunable diode laser absorption spectroscopy provides a means to precisely monitor specific bond rupture in the precursor during pyrolysis. Methylsilazane [CH3SiHNH]n,, a precursor to silicon-based ceramic thin films, was used to investigate the potential of this technique. Below the decomposition temperature, the intensity of the absorption line at 871.6±0.1 cm−1 corresponding to one of the harmonics from Si-CH3, increased linearly with the vapor pressure of methylsilazane up to 800 Pa and then decreased exponentially. The typical linewidths of the absorption line was approximately 0.006 cm−;1, orders of magnitude narrower than would be observable using conventional infrared techniques. The absorption line was detectable over a pressure range from less than 1 Pa to 10 kPa.

INTRACAVITY LASER ABSORPTION SPECTROSCOPY OF NO2 AND CH4 COOLED IN A SLIT JET SUPERSONIC EXPANSION

1991 ◽  
Vol 01 (C7) ◽  
pp. C7-471-C7-476
Author(s):  
A. CAMPARGUE ◽  
M. CHENEVIER ◽  
A. DELON ◽  
R. JOST ◽  
F. STOECKEL
Keyword(s):  
Absorption Spectroscopy ◽  
Laser Absorption Spectroscopy ◽  
Supersonic Expansion ◽  
Laser Absorption ◽  
Intracavity Laser

Monitoring the Fractional Distillation Purification of Inorganic Hydrides by Diode Laser Absorption Spectroscopy

2020 ◽  
Vol 56 (12) ◽  
pp. 1284-1289
Author(s):  
Ya. Ya. Ponurovskii ◽  
D. B. Stavrovskii ◽  
Yu. P. Shapovalov ◽  
M. V. Spiridonov ◽  
A. S. Kuz’michev ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Fractional Distillation ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption
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