| Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2010: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2009: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2008: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Research Abstract |
We have demonstrated table top terahertz electromagnetic wave source and extreme ultraviolet light source by using a controlled plasma produced by an ultrashort, intense laser pulse and pulse discharge. The terahertz radiation can be generated by the burst current produced by a laser created ionization front, which is induced an optical-field-induced ionization in air with a static electric field. The experimental results behave similarly to calculated results, and electric field amplitude of THz radiation increase with increase in applied voltage of a static electric field. We also have demonstrated a discharge-produced microplasma extreme ultraviolet source based on a pure potassium vapor. Potassium ions produced strong broadband emission around 40nm with a bandwidth of8 nm [full width at half-maximum (FWHM)]. The current-voltage characteristics of microdischarge suggest that the source operates in a hollow cathode mode. By comparison with atomic structure calculations, the broadband emission is found to be primarily due to 3d-3p transitions in potassium ions ranging from K^<2+> to K^<4+>.
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