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29.01

Vật lý

EIT nâng cao tính phi tuyến Self-Kerr trong hệ thống Lambda ba mức dưới doppler mở rộng

EIT enhanced Self-Kerr nonlinearity in the three-level Lambda system under doppler broadening

Communications in Physics

2014

3

217-224

0868-3166

Using density-matrix theory, an analytical expression of the self-Kerr nonlinear coefficient of a three-level lambda EIT medium for a weak probe light is derived. Influences of the coupling light and Doppler broadening on the self-Kerr coefficient are investigated and compared to experimental observation with a good agreement. The self-Kerr nonlinearity of the medium is madified and greatly enhanced in the spectral region of EIT window. Furthermore, sign, slope, and magnitude of the self-Kerr coefficient can be controlled with frequency and intensity of the coupling light and temperature of the medium. Specially, for a given set of fixed values of the parameters of coupling and probe lights, it could be able to choose an optimized temperature to have largest magnitude of the self-Kerr coefficient. Such controllable Kerr nonlinearity can find interesting applications in optoelectronic devices working with low-light intensity at various temperature conditions.

TTKHCNQG, CLv 2393