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21 September 2005 Nonlinear multiphoton processes with soft x-ray photons and its application to autocorrelation measurement
Katsumi Midorikawa, Hirokazu Hasegawa, Yasuo Nabekawa
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Proceedings Volume 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications; 592005 (2005) https://doi.org/10.1117/12.623654
Event: Optics and Photonics 2005, 2005, San Diego, California, United States
Abstract
We have observed multi-photon ionization processes such as two-photon double ionization and above threshold ionization in He at 42 eV using intense soft X-ray pulses produced by high-order harmonics. Using the two-photon double ionization, the pulse width of the 27th (42 eV) harmonic was measured by an autocorrelation technique, and found it to be 8 ns. The high-intensity soft X-ray radiation achieved by phase-matched high-order harmonics enables the investigation of these nonlinear optical processes, which were beyond the reach of conventional light sources.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Katsumi Midorikawa, Hirokazu Hasegawa, and Yasuo Nabekawa "Nonlinear multiphoton processes with soft x-ray photons and its application to autocorrelation measurement", Proc. SPIE 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications, 592005 (21 September 2005); https://doi.org/10.1117/12.623654
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KEYWORDS
Ionization
X-rays
Ions
Photons
Mirrors
Helium
Multiphoton processes
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