EIT enhanced self-Kerr nonlinearity in the three-level lambda system under Doppler broadening

Dinh Xuan Khoa, Le Van Doai, Pham Van Trong, Tran Manh Cuong, Vu Ngoc Sau, Nguyen Huy Bang, Le Nguyen Mai Anh


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 is basically modified and greatly enhanced in the spectral region corresponding to EIT transparent window. Furthermore, sign, slope, and magnitude of the self-Kerr coefficient can be controlled with frequency and intensity of the coupling light and temperature. Such controllable Kerr nonlinearity can find interesting applications in optoelectronic devices working with low-light intensity.


Kerr nonlinearity; atomic coherence; electromagnetically induced transparency

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DOI: https://doi.org/10.15625/0868-3166/24/3/3915 Display counter: Abstract : 205 views. PDF : 105 views.


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