| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Optical vortex has not been used for plasma diagnostics so far. We firstly performed an optical-vortex laser-absorption-spectroscopy experiment of metastable argon neutrals aiming for the proof-of-principle of flow velocity measurement using optical vortex beams. Because the azimuthal Doppler shift in optical vortex has spatial dependence, we evaluated the Doppler shifts at various positions by two-dimensional distribution of transmitted light intensity. Obtained frequency shift qualitatively agreed with theoretically predicted spatial dependence. However, its absolute value was far large from the actual flow velocity of argon neutrals, which is left open and requires further study.
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