Abstract
One decade has passed since the discovery of self-organized (photoinduced quasi-phase-matched) second-harmonic generation (SHG) in optical fibers [1-2]. This discovery has attracted considerable interest world-wide [3-16] due to the unusually strong χ(2) (second-order susceptibility) gratings induced purely by optical fields in glass (10−15-10−16 m/V, which were 4-5 orders of magnitude higher than one could explain by known physical processes). In 1991 the value of χ(2) has been increased to a new level of 1 pm/V by thermal poling [26]. 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?
© 1997 Optical Society of America
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