Plasma shutter for pulse shaping of TEA CO2 laser

Yanchen Qu; Xiaoyong Hu; Deming Ren; Bo Zhou; Wenmei Song

doi:10.1117/12.481808

5 September 2002 Plasma shutter for pulse shaping of TEA CO₂ laser

Yanchen Qu, Xiaoyong Hu, Deming Ren, Bo Zhou, Wenmei Song

Proceedings Volume 4914, High-Power Lasers and Applications II; (2002) https://doi.org/10.1117/12.481808
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Two types of plasma shutters which can achieve pulse shaping of transversely excited atmospheric-pressure (TEA) CO2 laser are presented. We have designed two optical devices, which are plasma shutter and laser triggering spark gas (LTSG). The pulse forming network circuit used for precise triggering control is designed. In experiment, optical triggering gas free-breakdown plasma shutter and electrical triggering plasma shutter controlled via LTSG are researched for pulse shaping of the TEA CO2 laser. The collimated laser beam is focused at the center of two ZnSe lenses, producing an intensity of approximately 7x 1O'°W/cm2. In order to optimize truncated laser pulses, some operating parameters which include gas types filled in plasma shutter, gas pressure, LTSG 's voltage, and so on, are investigated via experiments. Using this technique, the nitrogen "tail" of the TEA CO2 laser pulse can be clipped, thus shortening the output laser pulse from the duration ~60ns to ~30ns.

Citation Download Citation

Yanchen Qu, Xiaoyong Hu, Deming Ren, Bo Zhou, and Wenmei Song "Plasma shutter for pulse shaping of TEA CO₂ laser", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); https://doi.org/10.1117/12.481808

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