Dielectric Mirror

A dielectric mirror, also known as a Bragg mirror, consists of multiple thin layers of dielectric material deposited on a glass or optical substrate. By carefully choosing the type and thickness of these dielectric layers, one can design a mirror with specific reflectivity at different wavelengths of light. Dielectric mirrors find applications in laser cavity end mirrors, hot and cold mirrors, thin-film beamsplitters, and high-damage-threshold mirrors.

These mirrors operate based on the interference of light reflected from different layers within the dielectric stack. The layers have alternating high and low refractive indices, resulting in constructive interference. Well-designed dielectric coatings can achieve reflectivity exceeding 99% across the visible light spectrum.