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1. (WO1992011554) INTENSITY DIVIDING DEVICE

Pub. No.:    WO/1992/011554    International Application No.:    PCT/GB1991/002131
Publication Date: 1992/07/09 International Filing Date: 1991/12/02
IPC: G02B 6/28
H01P 1/16
Applicants: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
JENKINS, Richard, Michael
Inventors: JENKINS, Richard, Michael
Title: INTENSITY DIVIDING DEVICE
Abstract:
An intensity dividing device (10) incorporates a rectangular multimode waveguide (20) connected to an input waveguide (18) and a set of four output waveguides (22). The input waveguide (18) provides a fundamental mode input excitation of CO2 laser radiation to the multimode waveguide (20). The input waveguide (18) is offset from the multimode waveguide longitudinal axis (24). Consequently, both symmetric and antisymmetric modes of the multimode waveguide (20) are excited. Modal dispersion along the multimode waveguide produces electric field intensity maxima of differing magnitude centred on respective output waveguides (22). This provides division of the input radiation into a range of differing intensity outputs.