| Budget Amount *help |
¥145,340,000 (Direct Cost: ¥111,800,000、Indirect Cost: ¥33,540,000)
Fiscal Year 2015: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
Fiscal Year 2014: ¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Fiscal Year 2013: ¥27,950,000 (Direct Cost: ¥21,500,000、Indirect Cost: ¥6,450,000)
Fiscal Year 2012: ¥33,410,000 (Direct Cost: ¥25,700,000、Indirect Cost: ¥7,710,000)
Fiscal Year 2011: ¥44,590,000 (Direct Cost: ¥34,300,000、Indirect Cost: ¥10,290,000)
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| Outline of Final Research Achievements |
We have developed a novel BIBO-based optical parametric chirped pulse amplifier (OPCPA) system for producing intense ultrashort infrared pulses. We obtained record-breaking 1.5-mJ, 11-fs pulses at 1600 nm at a repetition rate of 1 kHz, which was best suited for the generation of attosecond soft-X-ray pulses. We observed a carrier-envelope phase-dependent behavior in the spectra of soft-X-ray harmonics, which supported the generation of single isolated attosecond pulses in 250-325 eV. We also carried out the soft-X-ray absorption spectroscopy of carbon material at the carbon K edge. We successfully identified the peak structures that originated from chemical bonding of carbon atoms. This result is an important step to realize ultrafast soft-X-ray absorption spectroscopy on attosecond time scales.
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