| Cheng Liang (Major in Physical Electronics)Directed by Wan ChongyiWe advanced a new type of Ultra-Violet preionization, the printed circuit board (PCB) preionization. With copper covering both sides of it, the printed circuit board in this type of preionization acted as a distributing capacitor coupler. Compared with other types of UV preionization, such as corona preionization, spark array preionization and semiconductor preionzation, PCB preionization is favorable of forming appropriate preionization intensity and better uniformity. The simplicity and compactness make PCB preionization more suitable for fast-transversely-flow system to produce high-pulse-repetition-rate and high average power laser. The new scheme has been successfully used in a mini TEA CO2 laser. Compared with corona preionization or spark array preionization, more output energy can be obtained. Moreover we introduced this new scheme successfully into a long-pulse medium-sized TEA CO2 laser for D5059 Laser Project. The specification of the laser met the needs of the project.We studied two irradiation styles, consisting of irradiating anode style and irradiating cathode style. ft was more favorable of acquiring more output energy using irradiating anode style. The result was quite different from that of cathode emission irradiated by UV, which played a major role in the traditional mechanism of preionization. NWe studied preliminary the Pulse-Forming-Network (PFN) discharge producing widepulse laser output. Also we advanced a design of main discharge electrodes and a simulation method using Pspice software.
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