BROADBAND DISPERSION-FREE OPTICAL FILTER CAVITIES BASED ON DIELECTRIC MIRRORS WITH COMPLEMENTARY DISPERSION

摘要

A substantially dispersion-free optical filter cavity includes a first multilayer mirror and a second multilayer mirror, wherein each mirror includes layers of a less-refractive material and layers of a more-refractive material, the more-refractive material having a higher index of refraction than the less-refractive material. The mirrors are separated by a spacing, and the thickness of a plurality of the layers in the second multilayer mirror differ from corresponding layers in the first multilayer mirror to provide the cavity with complementary group-delay dispersion across the cavity with a phase difference within, e.g., 0.015 rad across a range of wavelengths spanning at least, e.g., 50 nm.