固体ターゲットへのレーザ照射による真空中プラズマの発光形態

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  • Illumination Image Characteristics of Laser-Induced Plasma on Solid Target in Vacuum
  • コタイ ターゲット エ ノ レーザ ショウシャ ニ ヨル シンクウ チュウ プラズマ ノ ハッコウ ケイタイ

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This paper describes the laser-induced plasma characteristics at 100kPa-1Pa. Outgassing from the surface of space apparatus caused by charged particle collisions may cause discharges on dielectric surface. In order to quantitatively understand such outgassing phenomena, we used TEA-C02 laser focused to solid target and produced plasma on the target. We measured plasma characteristics using photodiode and still camera, and obtained plasma light waveforms and plasma illumination images. Then we investigated the laser-induced plasma formation mechanism. Experimental results revealed characteristics of laser-induced plasma such as plasma light intensity and plasma illumination image. As a result, at 100kPa-1kPa, the laser-induced plasma characteristies highly depended on the residual gas. On the other hand, at less than 1kPa, the plasma highly depended on the target material. Furthermore plasma illumination distribution showed the high dependence on pressure or target materials.

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