Abstract
Within the rotating-wave and Magnus approximations, the electrical anharmonicity induced in an atom or molecule aligned by a static electric field is shown to lead to the absorption of many photons delivered by a Gaussian-modulated laser pulse of finite intensity and duration. In the presence of the static field the effective area of the near-resonant pulse vanishes at prescribed intensity-dependent frequencies, resulting in the appearance of satellite fringes flanking the usual Gaussian line shape. The transition probability for excitation of the oriented system by a train of phase-coherent Gaussian pulses is calculated.
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