Silica fiber poling technology is used to induce a second-order nonlinearity or linear electro-optic coefficient into silica fiber, an amorphous centrosymmetric material without intrinsic second-order nonlinearity. This paper reports on three poling techniques used for silica fiber: thermal poling, CO2 laser-assisted poling, and ultraviolet (UV) poling. The characteristics, mechanisms, and latest research results for each poling technique are addressed.
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Xu et al. (2001) studied this question.