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1. (WO2001006280) METHOD OF WRITING GRATING STRUCTURES

Pub. No.:    WO/2001/006280    International Application No.:    PCT/AU2000/000839
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Wed Jul 12 01:59:59 CEST 2000
IPC: G02B 6/12
G02B 6/122
G02B 6/28
G02B 6/30
G02B 6/34
Applicants: THE UNIVERSITY OF SYDNEY
CANNING, John
Inventors: CANNING, John
Title: METHOD OF WRITING GRATING STRUCTURES
Abstract:
A grating structure is written in a photosensitive waveguide (17) by dividing a coherent beam (10) into at least three beams (12, 13, 14), and interfering them at the waveguide (17). The beams may comprise a zero order beam (12) and two first order beams (13, 14) diffracted by a phase mask (11), and their relative phases and amplitudes may be modulated to control and/or tune the grating period and shape. The method allows grating structures to be written in which a first order grating and a second order grating are superimposed.