| 摘要 |
PCT No. PCT/GB91/02131 Sec. 371 Date May 20, 1993 Sec. 102(e) Date May 20, 1993 PCT Filed Dec. 2, 1991 PCT Pub. No. WO92/11554 PCT Pub. Date Jul. 9, 1992.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.
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