| Budget Amount *help |
¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Raman back scattering in plasma has been tried as a novel high peak power laser by using our developed original laser systems. The Raman signal has not been detected clearly. Interaction time of 600 ps, which is decided by the pulse duration of the pump beam, have been observed to be too long for unstable laser-induced plasma and the plasma density was low. These led to an ineffective energy conversion of Raman back scattering. Our numerical calculation with experimental data agreed with that. It has been clearly shown that shortening the pulse duration of the pump laser from 600 ps to 1 ps enables efficient Raman back scattering with more than two-order higher laser intensity and short interaction duration. In addition, replacement of the gas with a solid-state target as plasma source increases the plasma density for further energy conversion.
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