DocumentCode :
1076040
Title :
Gain characteristics of an atmospheric sealed CW CO2laser
Author :
Akiba, Toshimitsu ; Nagai, Haruhiko ; Hishii, Masao
Author_Institution :
Mitsubishi Electric Corporation, Amagasaki, Japan
Volume :
15
Issue :
3
fYear :
1979
fDate :
3/1/1979 12:00:00 AM
Firstpage :
162
Lastpage :
170
Abstract :
Experimental and analytical investigations have been made on unsaturated gain g0of a CO2electric-discharge convection laser, in which discharge current flow, gas flow, and the optical axis are mutually perpendicular. Stable glow discharges in sealed gas mixtures of CO2, CO, N2, and He were maintained at pressures up to 780 torr with an input power density of about 90 W/cm3. The ratio of electric field to neutral particle density E/N was 1.7 \\times 10^{-16} V . cm2and was independent of the total gas pressure P . The electron density in a positive column of the glow discharge was about 4 \\times 10^{10} cm-3. Detailed spatial distributions of g0at a wavelength near 10.6 μm were measured in the pressure range from 100 to 780 torr. Measurements were also made on the current dependence of g0and on the change in gowith discharge time. The g0distributions along the gas flow direction were found to agree with those calculated from the electron density distribution and the relaxation rate constant of the upper laser level on the basis of continuity equations for a two-level model. The integrated value of g0along the flow direction was proportional to P-0.8when E/N , electron density, and gas temperature were held constant. A maximum value of the g0distribution, which was proportional to P-0.3, was 0.14 percent/cm at 780 torr.
Keywords :
CW lasers; Carbon dioxide lasers; Current measurement; Electrons; Fluid flow; Gas lasers; Glow discharges; Helium; Image motion analysis; Pressure measurement; Time measurement; Wavelength measurement;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1979.1069983
Filename :
1069983
Link To Document :
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