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3 Opto-Electronics Review

3 2005

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Spatial solitons in biased photorefractive media with quadratic electro-optic effect

100%

Ziółkowski A. , Weinert-Rączka E.

2005

tom Vol. 13, No. 2

135-140

Propagation of optical beams and properties of one-dimensional (1D) spatial solitons in biased photorefractive media with quadratic electro-optic effect are analysed. An exact analytic solution of the corresponding propagation problem is presented as well as a numerical investigation of the evolution of optical beams.

Discrete diffraction in an optically induced lattice in photorefractive media with a quadratic electro-optic effect

80%

Staroń G. , Weinert-Rączka E. , Urban P.

2005

tom Vol. 13, No. 2

93-102

Propagation of light in an optically induced waveguide array in biased photorefractive media with a quadratic electro-optic effect is investigated numerically with the beam propagation method. The refractive index distribution of the array is induced by two coherent plane waves interfering in a guiding layer in a photorefractive multiple quantum well (MQW) planar waveguide. The influence of modulation depth and the space period of an interference pattern as well as the external electric field intensity on diffraction properties of the array is analysed. The potential possibility of all-optical switching due to the dependence of the guided wave output distribution on the external waves parameters is shown.

Steady state photorefractive gratings in multiple quantum wells at high modulation depth

80%

Wichtowski M. , Weinert-Rączka E. , Gajda A.

2005

tom Vol. 13, No. 2

157-169

The steady-state analytical expressions for the space-charge field harmonics generated by the high contrast interference pattern in biased photorefractive material with ambipolar transport are presented. As an example semi-insulating multiple quantum wells film operating in the Franz-Keldysh geometry was considered. Parameters of photorefractive grating created by a quadratic electro-optic effect were analysed. Calculations based on the band transport model were limited to the low external field case what corresponds to the linear transport regime. In particular, it was found that the photogenerated carriers density has nearly harmonic distribution. Moreover, the fundamental component can be obtained from the linear equations what enables us to improve the solution for the space-charge field in bulk, nonresonant materials described by the classical Kukhtarev's model.