Schedule Aug 03, 2006
Hot Topics Talk: Carrier Envelope Phase Dependence of Double Ionization in Molecules at High Laser Intensities
André Bandrauk (U. Sherbrooke)

Recent advances in ultrashort intense laser pulse technology allows for unprecedented study of laser matter interaction on the time scale of a few optical cycles [1]. For few cycle pulses the electric field, E(t)=Eo(t) cos(?t+?) depends strongly on the phase ? of the carrier wave of frequency ? with respect to the pulse envelope Eo(t). ? is called the carrier envelope phase, CEP. Spatiotemporal variation of electromagnetic pulses E(t) consisting of very few cycles are now precisely known and can be shaped with attosecond precision via control over ?.

We have previously demonstrated by numerical simulations that intense few cycle laser pulses produce asymmetries in strong-field ionization of one electron atomic 3-D model systems [2] and that such asymmetry follows a universal CEP dependence which can be used to measure the duration of subfemtosecond pulses [3]. We investigate in the present work double ionization in a 2-D model of H2 and HeH+ and its dependence on CEP effects. The 2-D model allows for calculation of the angular dependence of the double electron ejection by intense 800 nm laser pulses in molecules and to compare to recent experimental results in Ar atoms [4]. Comparisons are also made at large internuclear distances where Charge Resonance Enhanced Ionization, CREI, dominates [5].

[1] T. Brabec, F. Krausz, Rev. Mod. Phys. 72, 545 (2000).
[2] S. Chelkowski, A.D. Bandrauk, A. Apolonski, Phys. Rev. A71, 053815 (2005); Opt. Lett. 29, 1557 (2004).
[3] A.D. Bandrauk, S. Chelkowski, H.S. Nguyen, Phys. Rev. A68, 041802 (2003).
[4] X. Liu et al., Phys. Rev. Lett. 93, 263001 (2004).
[5] G. Lagmago Kamta, A.D. Bandrauk, Phys. Rev. Lett. 94, 203003 (2005).

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