Kazansky, P.G. and Russell, P.St.J.
Thermally poled glass: frozen-in electric field or oriented dipoles?
Optics Communications, 110, (5-6), . (doi:10.1016/0030-4018(94)90260-7).
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Evidence that a frozen-in space charge field causes the appearance of high quadratic nonlinearities in thermally poled glass is obtained from experimental tests of the ratio of nonlinear tensor components and the spatial distribution of the induced chi(2). A mechanism to explain the fixation of the chi(2) near the anodic surface is proposed.
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