ИСТИНА

Several photonic applications need devices with special spectral and dispersive properties. Generating optical signals of a given form such as ultra-short laser pulses or super- continuum are among those tasks. Photonic crystals which spectral and dispersive properties are set by their design can be employed for that purpose. A simple model of such one-dimensional photonic crystal is a Bragg mirror, consisting of alternating dielectric layers with high and low refractive indices. This simple model enables us to understand the way of engineering optical properties. It is possible to achieve required dispersion law and to extend the bandwidth of the mirror at the same time by chirping width of the layers. These methods were mostly used for lasers and coatings. The same methods are now applied for the photonic crystal.