プラズマによるレーザービームのCooperative散乱

概要

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This report describes the observation of cooperative scattering of a Q-switched ruby laser light by shock produced plasma. The spectral distribution of the scattered light was measured using a grating spectroscope at an angle of 90° and 45° to the direction of the ruby laser light. A giant pulse of the Q-switched ruby laser was fired behind the reflected shock wave for initial pressure of 0.4mmHg in argon and for a shock velocity of 17 Mach. In the case of 90° scattering, assuming a plasma parameter α=0.85 theoretical curve accods very well with the measuredspectral distribution of the scattered light. The electron temperature and the electron density were determined to be 23, 000°K and 1.4 x 1016 cm-3, respectively. In the case of 450 scattering, the spectral distribution of the scattered light showed central peak and satellite peak. The wavelength shift of the satellite peak was 27Å. In this case a = 1.57, ne = 1.6 x 1016 cm-3 and Te= 26, 000°K were estimated. These values of the electron density and the electron temperature are in good agreement with the results of 90°scattering.
社団法人プラズマ・核融合学会の論文