Dielectric mirror optimization based on the phase-compensation method

Abstract

A phase-compensation method is presented to fully optimize multilayer reflectance bandwidth, spectral phase and group delay dispersion. For a given multilayer (A), a set of different phase-compensated dielectric mirrors (B) is achieved as a function of a single parameter: the so-called reference wavelength λr. With a correct selection of the parameter λr, a set of different dielectric multilayers can be obtained with fixed broadband reflectance regions and smooth spectral phases (independently of the layers’ thickness distribution) so that ultrashort pulses can be entirely reflected in such dielectric mirrors with a negligible amount of absorption and distortion. Hence, with an adequate numerical analysis via our phase-compensation method, experimental designs can be easily performed to obtain ad hoc dielectric mirrors for ultrashort pulse management.