Jens Buus

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The group index for TE modes in an asymmetrical slab waveguide is investigated, and a simple analytical expression is derived. It is shown that the product of the phase and group indices is related to the power fraction in each of the three layers of the waveguide. The results are of interest in the analysis of double heterostructure semiconductor(More)
A computer programme is described which can undertake automatic distribution of patients referred for elective surgery. The programme ensures coordinated reservation of operation and bed resources. The programme provides copies of admission and operation lists to the departments concerned and, similarly, it writes out distribution lists and summoning(More)
A second-order diffraction grating placed below the active region of a phase-locked resonant antiguided array selects the in-phase array mode in addition to its role as a single-longitudinal-mode selector. This type of array-mode discrimination relies on the fact that the resonant in-phase array mode has significantly better field overlap with the grating(More)