Coherence and Quantum Optics VI pp 493-496 | Cite as
Excitation of Three-State Atom with Minimum Population of Intermediate State
Abstract
Laser pulses that overlap in time are often used to transfer an atom or molecule from its ground state to an excited state that cannot be reached directly. In the simplest model for such a process, two transitions in a three-state atom or molecule are driven by two laser beams. We shall use the electric-dipole approximation, and treat the oscillating electric fields of the two laser beams as classical external fields. Each laser beam drives its own transition, and the direct transition from the ground state to the highest state cannot be driven. We use the rotating-wave approximation, and assume that the laser pulses are so short that relaxation terms in the equation of motion can be neglected. With these assumptions, the equation of motion can be solved analytically in several cases in which the applied oscillating fields have time-dependent amplitudes and detunings1. Given an analytic solution, we can reverse the direction of the time-axis, and find the effect of the reversed pulse pair on the three-state system.
Keywords
Rabi Frequency Occupation Probability Pulse Pair Complete Transfer Rectangular Pulse ShapePreview
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