engleski

Time dynamics of a multilevel system excited by a train of ultrashort pulses

We present an iterative analytic solution for the time dynamics of the 87Rb four-level atoms excited by a train of ultrashort pulses. It enables fast and accurate calculation of the system time evolution circumventing the use of time-consuming numerical procedures. The obtained solution is used to study the complex interaction of atoms with the pulse-train electric field, both in time and frequency domain. We investigate the influence of pulse-train physical parameters, such as the pulse peak power, the repetition frequency and the central laser wavelength on the accumulation of population and coherence in the system characterized by relaxation times larger than the pulse repetition period.

train of ultrashort pulses; accumulation effects; time dynamic of multilevel system

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