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The coherence properties of radiation and one-step absorption in four-level atom

Feng Gao

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

The radiation and one-step absorption of the four-level atom is studied.Atom's motivated state is not stable,it inevitably disintegrate into the lower energy state,which makes the phenomenon of radiation.This paper is on the basis of theories of quantum mechanics and Kraus operator,utilizing the reducible density rectangular method to probe into the transformation of density matrix opposite angles element and non-opposite angles element of the four-level atom,which in the case of the radiation and one-step absorption.The coherence properties of quantum states are analyzed.

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The radiation and one-step absorption of the four-level atom is studied.Atom's motivated state is not stable,it inevitably disintegrate into the lower energy state,which makes the phenomenon of radiation.This paper is on the basis of theories of quantum mechanics and Kraus operator,utilizing the reducible density rectangular method to probe into the transformation of density matrix opposite angles element and non-opposite angles element of the four-level atom,which in the case of the radiation and one-step absorption.The coherence properties of quantum states are analyzed.
Solid laser is a four-level system.This paper utilizes theories of quantum mechanics and Kraus operator,to analysis the four-level system which in the case of absorption as well as radiation.The object of the research is to probe into the transformation properties of density matrix.The result shows that probability of absorption and radiation condition is satisfied,between the second excited state and the first excited state forms reversion of particles and prepares for producing laser.It also shows that when particles transform from the second excited state to the first excited state and the first excited state to the ground state at very high probability,the system produces laser.
The coherence of two-level atom in a thermal radiation field without rotating wave approximation through an external controllable driving field was investigated. The time evolution properties of non-opposite angle element of two-level atom's reducible density rectangular array was discussed. Coherence properties of two-level atom was studied in degenerate two-photon processes when the two-level atom interacts with an driving field in the thermal radiation field . We obtained the properties of an external driving field when two-level atom's coherence is maintained.