Population difference study of few-cycle laser pulse propagating in near-resonant two-level atom medium
Department of Physics, Wuhan University,
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Received in final form: 1 October 2011
Published online: 10 November 2011
We have theoretically studied the propagation of few-cycle laser pulse in near-resonant two-level atom medium by solving Maxwell-Bloch equations with a predictor-corrector finite-difference time-domain method. Hyperbolic secant pulses with area 2π, 4π and 6π are adopted as the initial inputs. For large pulse area, the carrier-wave Rabi flopping occurs in the faster split 2π pulse and causes spectra broadening which subsequently increases the induced population difference. Combined with the contribution of periodically varying carrier-envelop phase, the maximum of population difference gives rise to an interesting phenomenon.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011