DocumentCode
1383424
Title
Accurate gas diagnostics for sealed-off CO2 lasers using near-infrared DFB semiconductor lasers
Author
Lorini, L. ; De Natale, P. ; Lapucci, A.
Author_Institution
Ist. Nazionale di Ottica, Florence, Italy
Volume
34
Issue
6
fYear
1998
fDate
6/1/1998 12:00:00 AM
Firstpage
949
Lastpage
954
Abstract
The selective spectroscopic detection of CO2 and H2O in the gas mixture of a 400-W sealed-off CO2 slab laser is reported. The detection is based on the acquisition of absorption Voigt profiles of two vibrational overtone transitions of CO 2 and H2O, obtained using two InGaAsP distributed feedback (DFB) semiconductor lasers. This spectroscopic method enables a direct absolute measurement of the temporal evolution for the concentrations inside the laser active volume. Monitoring takes place during laser operation without gas extraction. The experiments carried out on CO2 and H2O abundances confirm the paramount importance of wall desorbance phenomena in all-metal radio frequency (RF) excited lasers
Keywords
carbon compounds; chemical variables measurement; gas lasers; laser variables measurement; measurement by laser beam; monitoring; spectral line breadth; spectrochemical analysis; vibrational states; 400 W; CO2; CO2 slab laser; H2O; InGaAsP; InGaAsP DFB semiconductor lasers; absorption Voigt profiles; accurate gas diagnostics; all-metal RF excited lasers; concentration; direct absolute measurement; gas mixture; laser active volume; monitoring; near-infrared DFB semiconductor lasers; sealed-off CO2 lasers; selective spectroscopic detection; spectroscopic method; temporal evolution; vibrational overtone transitions; wall desorbance phenomena; Absorption; Distributed feedback devices; Gas detectors; Gas lasers; Laser feedback; Laser transitions; Radio frequency; Semiconductor lasers; Slabs; Spectroscopy;
fLanguage
English
Journal_Title
Quantum Electronics, IEEE Journal of
Publisher
ieee
ISSN
0018-9197
Type
jour
DOI
10.1109/3.678590
Filename
678590
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