Nonlinear Interaction of Intense Attosecond XUV Pulses with Atoms and Molecules
We have observed nonlinear optical processes such as two-photon double ionization and above threshold ionization of rare gases in the xuv region with intense high-order harmonics. Using two-photon double ionization in He, the pulse width of the 27th (42 eV) harmonic was measured by an autocorrelation technique, and found it to be 8 ns. A train of attosecond pulses was also characterized directly by the energy-resolved autocorrelation of the above threshold ionized electrons.
KeywordsHelium Coherence Autocorrelation Sapphire Dura
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- 10.H. Hasegawa, E. J. Takahashi, Y. Nabekawa, K. Midorikawa: Laser Phys. 15, 812-820, 2005.Google Scholar