Kazansky, P.G. and Pruneri, V.
Fundamentals of glass poling: from self-organization to electric-field poling.
In, Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP), Williamsburg, US,
26 - 28 Oct 1997.
One decade has passed since the discovery of self-organized (photoinduced quasi-phase-matched) second-harmonic generation (SHG) in optical fibers. This discovery has attracted considerable interest world-wide due to the unusually strong chi (2) (second-order susceptibility) gratings induced purely by optical fields in glass (10 m/V, which were 4-5 orders of magnitude higher than one could explain by known physical processes). In 1991 the value of chi (2) has been increased to a new level of 1pm/V by thermal poling. In this paper we discuss fundamentals of glass poling, trying to answer the question: What is the limit of a second-order nonlinearity in glass?
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