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

Abstract

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.

Creation of Hollow-Gaussian Beam for Optical Trap by Dual-beam Nonliear Fabry-perot Interferometer

“…However, the hollow width of created hollow-Gaussian beam is not controllable till now. Principally, the bistable optical device operates based on the optical phase modulation in Kerr medium [13][14][15][16][17][18][19][20][21][22][23][24]. In the last work [25] we investigated the bistability of nonlinear Fabry-Perot interferometer (NFPI) sandwiched oil red O (ORO) with a very thin thickness of 0.1 mm.…”