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Acta Sinica Quantum Optica

The Influence of Absolute Phase on Population of Three-Level Λ-Type Atoms

Zhizhan Xu

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

By using the numerical solution of time-dependent shrodinger equation,the paper studies a few factors,such as absolute phase and chirp rate that affect the transfer probability in the process that ultrashort laser pulses interact with three-level Λ-type atoms.It is found that absolute phase and chirp rate are important factors that affect the transfer probability.By modulating absolute phase and chirp rate,we can achieve the maximal transfer probability can be achieved.This result supports the control of transfer probability experimentally.

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By using the numerical solution of time-dependent shrodinger equation,the paper studies a few factors,such as absolute phase and chirp rate that affect the transfer probability in the process that ultrashort laser pulses interact with three-level Λ-type atoms.It is found that absolute phase and chirp rate are important factors that affect the transfer probability.By modulating absolute phase and chirp rate,we can achieve the maximal transfer probability can be achieved.This result supports the control of transfer probability experimentally.
The ultrafast particle population transfer in a ■-type three-level atomic system driven by linearly polarized chirped Gauss femtosecond laser pulse is investigated by using numerical solution of the Schrdinger equation without the rotating wave approximation(RWA).It is shown that the population transfer is mainly determined by the Rabi frequency(intensity) of the driving laser field and chirp rate,and the ratio of two dipole moments and the pulse width also have obvious effect on the population transfer.By choosing suitable values of the above parameters,nearly complete population transfer(99.6%) can be realized.
It is shown that, when two femtosecond chirped Gaussian pulses with equal pulse area and same size but opposite sign of the chirp coefficient, which will be simply called as double pulses, overlap and propagate in the three-level Λ-type atomic medium, both coherence between the double pulses and interaction between the double pulses and the atomic medium arise. Adjusting size of the chirp coefficient can change shape, i.e. field distribution, of the composite pulse of the double pulses, at the same time affect the interaction between the composite pulse field and atoms, and thereby control oscillation process and value of the atomic population. By selecting suitable size of the chirp coefficient, we can make the atoms at the lowest level exciting completely to the higher level; moreover the new population distribution is stationary. It is also show that, for the double pulses with any area, efficient and stable population transfer always can be realized by adjusting size of the chirp coefficient. And this conclusion doesn't vary with the pulse width or the medium density varying.
We investigate the behavior of a three-level atomic system with \ensuremath{\Lambda} structure of levels in the field of a sequence of short frequency-chirped bichromatic laser pulses (BLP's) in the adiabatic passage regime of interaction. We show that the efficiency of the population transfer in this atomic system is sensitive to the relative phase of the pulses forming the BLP when the atom is prepared in a coherent superposition of its two ground states initially. We propose to use this sensitivity for coherent fast and robust writing and reading of optical phase information. The initial preparation of the atom in the ``dark'' superposition state is suggested through the action of a sequence of a few frequency-chirped BLP's with duration longer than the atomic relaxation time.