Abstract:Several relations between the real and imaginary part of an analytic function are derived from causality conditions. These relations are applied to the calculation of the complex index of a crystal from transmission or reflection measurements. It is shown by some examples how it is possible to use at best experimental data.En utilisant la condition de causalit&, plusieurs relations sont Btablies entre la partie rBelle et la partie imaginaire d'une fonction analytique. Ces relations sont appliquhes a u calcul d… Show more
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