Anti-reflective coating
An antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost due to reflection. In complex systems such as telescopes and microscopes the reduction in reflections also improves the contrast of the image by elimination of stray light. This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight.Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index. Layer thicknesses are chosen to produce destructive interference in the beams reflected from the interfaces, and constructive interference in the corresponding transmitted beams. This makes the structure's performance change with wavelength and incident angle, so that color effects often appear at oblique angles. A wavelength range must be specified when designing or ordering such coatings, but good performance can often be achieved for a relatively wide range of frequencies: usually a choice of IR, visible, or UV is offered.
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Large electron-beam evaporation optical coating equipment HCEB-2700 Optical Coatings Hcvac
Chamber dimensions [Customizable (Data for Reference Only)]: Φ2700 x H1850 Load capacity [Customizable (Data for Reference Only)]: 5.3 m2 Structure [Customizable (Data for Reference Only)]: Vertical, front-opening door, SUS304 stainless steel
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Antireflection-coated sapphire window Optical Coatings Uni-lens
Abbe number: 72.24 Birefringence [Visible light orthogonal to the optical axis]: 0.008 Clear Aperture Dimension: ≥90%
Sapphire windows retain high strength at elevated temperatures, with good thermal properties and excellent transparency. They resist common acids and alkalis at temperatures up to 1000°C and hydrogen fluoride below 300°C. These properties support use in harsh environments requiring optical transmission from vacuum ultraviolet to near infrared.
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BK7 antireflection-coated window Optical Coatings Uni-lens
Material [Question 1 in the body text]: N-BK7, Schott borosilicate Dimensional Tolerance [Standard; No unit stated in the table]: +0.0/-0.2 Thickness Tolerance [Standard; No unit stated in the table]: ±0.2
BK7 windows are the most common window type, with good performance in visible and near-infrared bands. BK7 windows are ideal where transmitted-beam deviation must be minimized and are suitable for AR coatings.
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