Title :
Three-photon ionization of He+ by the 13th harmonic of a Ti:sapphire laser
Author :
Ishikawa, Kenichi
Author_Institution :
Dept. of Quantum Eng. & Syst. Sci., Tokyo Univ., Japan
Abstract :
In this study, numerical experiments of three-photon ionization of He+ are performed. He+ is chosen over He because it is easy to prepare (by optical field ionization) and its 1s - 2s transition (40.8 eV) is close to the two-photon resonance of the 13th harmonics of a Ti:sapphire laser. Moreover, the exact solution can be delivered for this hydrogenlike system. We solve the time-dependent Schrodinger equation numerically using the Peaceman-Rachford method. Results show that this process is an attractive candidate for the observation of a third-order nonlinear optical effect and even above-threshold ionization in the XUV range.
Keywords :
Schrodinger equation; helium; multiphoton processes; optical harmonic generation; photoionisation; quantum optics; solid lasers; titanium; ultraviolet spectra; 13th harmonic; 40.8 eV; Al2O3:Ti; He; He+; Peaceman-Rachford method; Ti:sapphire laser; XUV range; optical field ionization; third-order nonlinear optical effect; three-photon ionization; time-dependent Schrodinger equation; two-photon resonance; Electrons; Helium; Ionization; Laser transitions; Nonlinear optics; Optical pulse generation; Optical pulses; Optical saturation; Resonance; Systems engineering and theory;
Conference_Titel :
Quantum Electronics Conference, 2003. EQEC '03. European
Print_ISBN :
0-7803-7733-8
DOI :
10.1109/EQEC.2003.1313920
