@Article{, title={Theoretical Design for Dielectric Chirped Mirrors}, author={Elham Jasim Mohammad}, journal={Journal of College of Education مجلة كلية التربية}, volume={}, number={3}, pages={27-44}, year={2015}, abstract={This paper is concerned with theoretical study on optoelectronicsphysics to design dielectric chirped mirrors. Their theoretical analysisgenerally relies on the well-known scattering matrix formalism derivedfrom the Maxwell equations. Laser performance strongly depends on thequality of optical coatings: reflectance of high reflectors should approachthe ideal 100% value at the operation wavelengths in order to minimizelaser intracavity losses and output coupling has to be set to specific valuesto ensure optimal operation.This paper reports a theoretical design of chirped mirror to achieve highreflectivity and dispersion compensation over a broad bandwidth. Analyticexpressions for reflectivity, group delay and group delay dispersion areused.The aim is to compress the limits of pulse duration to reach femtosecondscale. The idea of chirped mirrors is based on the quarter-wave stackconcept as a building block of dielectric high reflector. The quarter wavestack cannot be used in general as a dispersion element, therefore, amodulation of periodical structure are introduced in order to achieve thedesired group delay dispersion.Dielectric materials TiO2/SiO2 arranged as a periodic stack have been usedto design chirped mirrors using the Fused Silica as a substrate.In this paper we demonstrate a chirped dielectric multilayer mirror withcontrolled reflectivity and dispersion in the wavelength range 650 900nm,it exhibits a reflectivity of >99.98%. Furthermore, group delay dispersionshows monotonic behavior within wavelength range.

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