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1. (WO2001006304) PERIODIC OPTICAL POLING OF WAVEGUIDES FOR QUASI PHASE MATCHING

Pub. No.:    WO/2001/006304    International Application No.:    PCT/GB2000/002839
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Sat Jul 22 01:59:59 CEST 2000
IPC: G02F 1/35
G02F 1/355
G02F 1/365
G02F 1/377
G02F 1/383
G02F 1/39
Applicants: UNIVERSITY OF SOUTHAMPTON
BONFRATE, Gabriele
KAZANSKY, Petr, Georgevich
PRUNERI, Valerio
Inventors: BONFRATE, Gabriele
KAZANSKY, Petr, Georgevich
PRUNERI, Valerio
Title: PERIODIC OPTICAL POLING OF WAVEGUIDES FOR QUASI PHASE MATCHING
Abstract:
A method of and apparatus for creating a second order non-linearity profile along a waveguide. The method comprises: thermally poling a waveguide structure to generate a second order non-linearity; placing a mask adjacent to the waveguide structure; and exposing the waveguide structure with UV light through the mask to selectively erase the second order non-linearity along the waveguide structure. The mask may be an amplitude mask or phase mask. In a preferred embodiment an amplitude mask is used in combination with an incoherent UV light source to produce selective erasure of a thermally poled second order non-linearity. Apparatus for carrying out this method and devices based on waveguide structures fabricated using the method are also described.