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AIST TODAYNo.16 Spring 2005 [ PDF:17.6MB ]

Contents List Message:Toward the Second Research Phase Feature : Volcanic Eruptions and the Blessings from the Earth Research Hot Line In Brief

Coherent control of molecular orientation by two-color laser fields

We demonstrate molecular orientation by using phase-controlled two-color ω +2 ω laser pulses with an intensity of 1.0x1012 W/cm2 and a pulse duration of 130 fs. This method performed well because (1) molecular orientation can be achieved by only optical fields; (2) the direction of orientation is easily switched by changing the sign of the quantum interference; and (3) this method is free from any resonance constraint and thus can be applied to any molecule.
Figure
Fig. Method to observe molecular orientation induced by phase-controlled two-color ω +2 ω laser pulses.
The asymmetry of ω +2 ω field can discriminate between parallel and antiparallel configurations of polar molecules. The orientation of molecules can be monitored by the directional asymmetries of the photofragment angular distribution in dissociative ionization.

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AIST Today Vol.5,No3 (2005-No.16) 32

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