Published 09/07/2018
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Temporal behavior of two-wave-mixing in photorefractive inp:fe versus temperature

N.Fressengeas , M.Chauvet , D.Wolfersberger , G.Kugel , N.Khelfaoui

Keywords
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Introduction
The basic mechanism of the eect is the excitation and re-distribution of charge carriers inside a crystal as a result of non-uniform illumination. The redistributed charges give rise to a non-uniform internal electric eld and thus to spatial variations in the refractive index of the crystal through the Pockels eect. TIME DEPENDANT SPACE-CHARGE FIELD IN InP : F e The basic principles of the photorefractive eect in InP:Fe are well known.
Resume
The temporal response of two-wave-mixing in photorefractive InP:Fe under a dc electric field at different temperatures has been studied. In particular, the temperature dependence of the characteristic time constant has been studied both theoretically and experimentally, showing a strongly decreasing time constant with increasing temperature.
Method
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Results
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Conclusion
The redistributed charges give rise to a non-uniform internal electric eld and thus to spatial variations in the refractive index of the crystal through the Pockels eect. This leads to the formation of a local space-charge eld Esc and thus to the modulation of the refractive index. The principle of two-wave-mixing is to propagate si-multaneously in a photorefractive crystal two coherent beams, which have an angle between their directions of propagation. cos ). Im{Esc} where n is the refractive index, ref f is the eective electro-optic coecient, is the beam wavelength in vac-uum and Im{Esc} is the imaginary part of the space-charge eld Esc.
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