What are supermirrors?

Supermirrors are Bragg mirrors optimized for extremely high reflectivities and low optical losses. Supermirror reflectivities are typically over 99.98% and can even get up to 99.9999% in extreme cases. While dielectric coatings are typically used, this new class of Semiconductor Supermirrors uses a novel crystalline coating technique instead which reduces the scattering and absorption losses to unprecedented levels, while enabling ultralow Brownian noise and high thermal conductivity.