Whenever light passes from one medium into another medium with different optical properties, most notably refractive index, part of the light is reflected and part of the light is transmitted. The intensity ratio of the reflected and refracted components is a function mainly of the difference in refractive index among the materials, the polarization of the incident light and the angle incidence.

As light passes through an uncoated glass substrate, approximately 4% will be reflected at each surface, this result in a total transmission of only 92% of the incident light. Coating each component will increase the throughput of the system and reduce hazards caused by reflections traveling backwards through the system (ghost images).

Optical coatings are often used to enhance the performance of optical components. They are also used to reflect, absorb, and selectively reflect/transmit light based on wavelength or the state of polarization.

Following coatings are what Rising EO can provide:

The optics being coated is usually called the substrate. The coating is deposited in high vacuum using the process of evaporation on substrate. Coating materials include metal (Au, Al, Ag, Ni-Cr, Cr and so on), dielectrics (Oxides, Fluorides and Sulfides) and semiconductors (Si, Ge).

Optical interference coatings respond differently to s and p polarized light. For this reason, it is essential to specify s, p, or random (the average of the s and p performance) polarization when the angle of incidence exceeds 20 degrees.