CO2 Optical Gain in Gas Dynamic Lasers Using CO2/N2/H2O/CO/H2 Mixtures.
Technical rept. 7 May-30 Jun 71,
MATHEMATICAL SCIENCES NORTHWEST INC BELLEVUE WA
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The use of CO rather than N2 as the vibrational energy storage molecule in CO2 gas dynamic lasers is investigated. Measurements of optical gain are made in gas mixtures containing CO2, N2, H2O, CO, and H2 at chamber pressures from 10 to 40 atm and chamber temperatures from 1400 to 1800 K. A two-dimensional, 1-mm throat, area ratio 20 rapid expansion nozzle is used. Single-pass optical gain measurements are made over a 30-cm optical path to an accuracy of 0.03m at distances of 5 cm and 15 cm downstream of the nozzle throat. The results, when compared with analytical predictions, verify the prediction techniques and the available vibrational relaxation rate data. It is found that H2 is significant in causing collisional decay of the lower laser level 100 of CO2 and contributes to the loss of N2 and CO vibrational energy. Author
- Lasers and Masers