Other
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvl..94d3001n&link_type=abstract
Physical Review Letters, vol. 94, Issue 4, id. 043001
Other
114
Photoionization Of Atoms And Ions, Strong-Field Excitation Of Optical Transitions In Quantum Systems, Multiphoton Processes, Dynamic Stark Shift, Ultrafast Processes, Optical Pulse Generation And Pulse Compression
Scientific paper
We report on the observation of doubly charged helium ions produced by a nonlinear interaction between a helium atom and photons with a photon energy of 42eV which are generated with the 27th harmonic of a femtosecond pulse from a Ti:sapphire laser. The number of ions is proportional to the square of the intensity of the 27th harmonic pulse, and thus two-photon double ionization should be dominantly induced as compared with other nonlinear processes accompanying sequential ionization via a singly charged ion. This phenomenon is utilized to measure the pulse duration of the 27th harmonic pulse by using an autocorrelation technique, for the first time to our knowledge, and as a result a duration of 8fs is found.
Hasegawa Hirokazu
Midorikawa Katsumi
Nabekawa Yasuo
Takahashi Eiji J.
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