2014 Fiscal Year Final Research Report
Generation of soft X-ray attosecond pulses by use of intense ifrared pulses and their characterization
| Project/Area Number |
25790063
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | アト秒パルス発生 / 軟X線高調波 / 超高速軟X線分光 |
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| Outline of Final Research Achievements |
In this research, we have developed and applied an optical parametric chirped-pulse amplifier, which is capable of delivering 0.55 mJ, 10 fs infrared pulses with a repetition rate of 1 kHz at 1600 nm to generate high harmonics in the water window. The spectra of soft x-ray radiation exhibit the clear dependence on the electric waveform of the sub-two-cycle infrared pulses. The cutoff of soft x-ray harmonics reaches 325 eV, which is well beyond the carbon K edge. The waveform dependence indicates the generation of isolated attosecond soft x-ray pulses. Furthermore, we have upgrade the parametric amplifier and the millijoule infrared pulses from the upgraded light source generate bright soft x-ray radiation at the carbon K edge. This yield enhancement is necessary for the characterization of the attosecond soft x-ray pulses based on time-resolved photoelectron spectroscopy and the demonstration ultrafast soft x-ray absorption spectroscopy, which we are working on.
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| Free Research Field |
物理学
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