Title :
Diagnostics of TM010-mode microwave cavity discharges in CO2-N2-He laser gas mixtures. II. Measurement of vibration temperature
Author :
Ikeda, Tetsuya ; Danno, Minoru
Author_Institution :
Mitsubishi Heavy Ind. Ltd., Yokohama, Japan
fDate :
8/1/1995 12:00:00 AM
Abstract :
For pt. I see ibid., vol., 31, no. 8, p. 1525-32 (1995). The plasma temperatures in microwave discharged CO2-N2-He laser gas mixtures were examined using the spectroscopic and electrostatic probe methods. A vibration temperature of N2 molecules, obtained spectroscopically, was determined to be nearly 7000 K without gas circulation and to be nearly 4000 K at the mass flow rate of 4.2 kg/h. It is found that an efficiency of laser output power exceed 14% (RF to laser output power conversion ratio) below the vibration temperature of 4000 K. The values of vibration temperature obtained were higher than those reported in DC discharges
Keywords :
carbon compounds; cavity resonators; discharges (electric); gas lasers; gas mixtures; helium; high-frequency discharges; laser beams; laser cavity resonators; laser modes; nitrogen; plasma; plasma diagnostics; plasma flow; plasma probes; plasma temperature; spontaneous emission; 14 percent; 4000 K; 7000 K; CO2; CO2-N2-He; DC discharge; RF power; TM010-mode microwave cavity discharges; electrostatic probe methods; gas circulation; laser gas mixtures; laser output power; mass flow rate; microwave discharge; spectroscopic methods; vibration temperature; Electrostatics; Gas lasers; Masers; Mass spectroscopy; Microwave theory and techniques; Plasma temperature; Power generation; Power lasers; Probes; Radio frequency;
Journal_Title :
Quantum Electronics, IEEE Journal of
