Fermann, M.E., Li, L., Farries, M.C. and Payne, D.N.
Second-harmonic generation in poled optical fibres: dynamic and phasematching techniques.
In, Nonlinear Guided Wave Phenomena Conference, Houston, US,
02 - 04 Feb 1989.
It has recently been shown that large second-order nonlinearities may be induced in optical fibres by an excitation poling technique. In this, high-intensity blue light is launched the fibre core. Two-photon absorption then gives rise to the excitation of defect centres, which align in the presence of the dc-field. The process is strongly linked to the generation of chi (2)-gratings from noise or by seeding and the formation of Hill-gratings
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