Dissertation
Dissertation > Mathematical sciences and chemical > Physics > Molecular physics, atomic physics > Atomic Physics

The Research on Linear and Nonlinear Susceptibility in Four-level and Three-level Atomic Systems

Author DuYingJie
Tutor ZhangJunXiang
School Shanxi University
Course Optical Engineering
Keywords Rabi frequency Energy level decay rate Nonlinear refractive index Optical ring cavity EIT
CLC O562
Type Master's thesis
Year 2004
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The atomic coherence inversion laser , the enhancement of the nonlinear process , the storage of light pulses and laser cooling in many areas of quantum optics has a potential application value . We did a series of in-depth study , two of the main contents of this article : first , to study the atomic coherence effects in the N-type four-level atomic system . Compared with the three - level atomic system , four-level atomic coherence can lead to the generation of electromagnetically induced transparency can produce the phenomenon of electromagnetic induction absorption , depending on the size of the control of the intensity of the light and the fourth level decay rate . Second, in theory, calculated for an A -type three-level system of nonlinear optical ring cavity measuring medium refractive index . The calculation results show that near resonance at the atomic two-photon cross-phase nonlinear refractive index n 2 and cross- phase shift dramatically increase . This system has an important value in the development of optical information processing devices .

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