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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 TEMTO can provide:

 
Coating Types
Properties and Applications
Anti-Reflective Coatings (AR) Anti-reflective coatings can be added to finished lenses to improve vision and appearance.
High Reflective Coatings (HR) Dielectric coating provides high reflectance over a broad bandwidth. Ideal for a tunable laser or in white light applications, used in 250nm ~ 2200nm. Metallic coatings have low peak reflectance, mechanical durability and high damage threshold. Insensitive to angle of incidence and polarization, used in near-UV, visible and near-IR.
Partial Reflective Coatings (PR) Perfect for beamsplitters application.
 
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.

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