Types of product
If the task is to achieve a sufficiently high coefficient (on average more than 70%) of reflection in the visible to the deep IR range of the spectrum, metal mirrors are suitable. As a rule, we use silicon as the substrate for metal mirrors, and gold or aluminum as the reflective material. Such mirrors operate well in CO2 lasers, where high thermal conductivity of the substrate is an important parameter.
Unlike metal mirrors, dielectric mirrors may be more flexibly "adjusted" to the customer's requirements; they have a higher reflection coefficient, mechanical and chemical resistance, and increased radiation resistance. At the same time, there is the possibility of applying highly reflective broadband coatings. The reflection coefficient of such mirrors at the operating wavelength may exceed 99.5%.
Here, the dielectric coating allows for division of the light beam into transmitted and reflected beams in the required ratio for a specific wavelength or wavelength range. Thus, it is possible to obtain dichroic mirrors, the so-called "cold" and "hot" mirrors.