Dielectric Coated Flat Mirror

A dielectric mirror, also known as a Bragg mirror, is made of multiple alternating layers of transparent dielectric materials. It achieves high reflectivity at specific wavelengths through constructive interference. Its design can target narrowband or broadband reflection while transmitting other wavelengths.

Dielectric mirrors are fabricated by alternately depositing high and low refractive index dielectric materials onto substrates such as glass or fused silica. By stacking multiple layers, reflectivity at specific wavelengths can exceed 99.9% due to constructive interference.

A broadband dielectric mirror is designed with non-uniform layer thicknesses or material combinations to create overlapping interference conditions. It reflects a wide range of wavelengths, often spanning several hundred nanometers, rather than a single or narrow wavelength band.

A dielectric mirror film or coating refers to the multilayer dielectric stack deposited on a substrate. It can be manufactured using physical vapor deposition (PVD), chemical vapor deposition (CVD), or sputtering techniques. The design can be customized for specific wavelengths, angles of incidence, or polarization states.

Dielectric mirrors are made of multilayer dielectric materials and can achieve reflectivity greater than 99.9% at specific wavelengths or angles. They can be designed for narrowband or broadband performance and have extremely low absorption and scattering losses, producing minimal heat. They are mainly used in lasers, precision optics, and spectrometers.
Metallic mirrors typically use aluminum, silver, or gold coatings. Due to absorption losses, their reflectivity usually ranges between 90% and 98%. Metallic mirrors offer natural broadband reflection and are commonly used in cost-effective optical components.