Research On Discharge Of Diode Pumped Argon Atom Gas Lasers

Diode pumped rare gas lasers(DPRGLs)are new type gas lasers pumping rare gas atoms with hybrid methods of electrical discharge and diode lasers,with many excellent features such as high beam quality,high quantum efficiency,and good atmospheric transmission.The wavelength of representative argon atom lasers is 912.3nm in the near infrared band,which lies in the absorption range of satellite GaAs battery and it is an important light source of satellite charging technology.The discharge mechanism of diode pumped rare gas lasers is studied in three kinds of discharge types based on the particle collision and motion model of gas discharge.(1)The electrical characteristics of argon-helium rare gas mixture were analyzed with DC glow discharge theory.The gas breakdown voltage,the radial particle distribution and the vertical potential distribution of the glow discharge area were calculated.And the maximum pressure range is analyzed and the optimum ratio of argon-helium mixed gas was determined by observing discharge stability in DC glow discharge experiment.(2)The main physical processes of gas breakdown on the transverse excitation atmospheric pressure(TEA)condition are analyzed on the basis of the streamer theory.The main techniques of maintaining discharge stability are studied and the main technologies of pre-ionization and the design of uniform field electrode are analyzed.(3)On the basis of the transverse discharge,the characteristics of the mixed gas are analyzed according to the one-dimensional model of the RF breakdown theory,distinguishing the main physical processes in different frequency ranges and calculating the corresponding breakdown voltage.The characteristics of gas load under RF excitation are modeled and calculated,and the matching network is designed according to the calculation result,which improves the energy feeding efficiency of the RF power supply.Through the research and analysis of different discharge modes,the development of the discharge from DC to TEA to lateral RF excitation is summarized,the optimal argon-helium gas mixture ratio,working pressure and RF frequency are determined,and the methods to improve discharge efficiency and sustain discharge stability are raised,providing design ideas for the study of feasible rare gas lasers.