Li, L. and Fermann, M.E.
Poling techniques for optical fibers.
QELS: Conference on Quantum Electronics & Laser Science, Baltimore, US,
24 - 28 Apr 1989.
Normally, only non-centro-symmetric crystalline materials exhibit second-order optical non-linearities. A material with a large second-order non-linearity is required for use in second-harmonic generation, Pockels modulators and parametric oscillators. Glass, being an amorphous material, exhibits the usual third-order non-linear behaviour, but not second-order effects. However, poling of an optical fibre by simultaneous excitation and orientation of defect centres has recently been demonstrated and leads to the creation of permanent, large second-order non-linearities
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