Measurement and calculation of the gain and of the vibrational temperatures in a CO/sub 2/ gasdynamic laser
Measurements of the intensity of spontaneous infrared radiation emitted by the active medium of a CO/sub 2/ gasdynamic laser in the form of bands at 4.3 and 2.7 ..mu.. were used to determine the vibrational temperatures of the asymmetric and combination modes of CO/sub 2/, and to calculate the gain for the 00/sup 0/1 ..-->.. 10/sup 0/0 laser transition. Measurements were also made of the gain using a probe laser beam. Mixtures of the compositions CO/sub 2/:N/sub 2/:He = 1:4:5 and CO/sub 2/:N/sub 2/ = 1.9 were investigated for various parameters of the gas in front of the nozzle. A good agreement was obtained between the results of measurements of the gain by two independent methods, which demonstrated that the ''spontaneous'' method for the diagnostics of CO/sub 2/ gasdynamic lasers was reliable. Measurements of the vibrational temperatures of gaseous carbon dioxide revealed a more rapid relaxation of the asymmetric CO/sub 2/ mode than the relaxation predicted theoretically.
- Research Organization:
- Institute of Chemical Physics, Academy of Sciences of the USSR, Moscow
- OSTI ID:
- 6019742
- Journal Information:
- Sov. J. Quant. Electron. (Engl. Transl.); (United States), Journal Name: Sov. J. Quant. Electron. (Engl. Transl.); (United States) Vol. 11:7; ISSN SJQEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CARBON DIOXIDE LASERS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GAIN
GAS LASERS
GASES
HELIUM
INFRARED RADIATION
LASERS
NITROGEN
NONMETALS
RADIATIONS
RARE GASES
TEMPERATURE DISTRIBUTION
VIBRATIONAL STATES