Opticalcoating

An anti-reflection (AR) coating is a type of optical coating applied to the surface of optical filters and other optical elements to reduce reflection. In typical imaging systems, this improves 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.

Material UV FS Surface quality 40-20 scratch & dig (MIL-PRF-13830B) Clear aperture 90% of the diameter Diameter tolerance +0.00, -0.12 mm Thickness tolerance ±0.2 mm Surface irregularity λ/8 @ 633 nm Concentricity 3 arcmin Paraxial focal length ±2% @ 355 nm

anti reflective coating中文

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anti-reflectioncoating

Lenses can be supplied coated. For required coating please refer to the COATINGS section. If you would like to order a coated lens, please note the code of the lens and the code of the coating in your request.

If you would like to order a range of lenses with different focal lengths, please have a look at our UV FS lens kit offers.

Plano-convex lenses have flat surface on one side and spherical surface on the other. They are widely used in telescopes, microscopes, collimators, optical transceivers, magnifiers, condenser systems and eyepieces.

anti-reflective coating是什么

Andover produces a non-radioactive dielectric multilayer coating designed to reduce the reflection of Germanium substrates in the infrared. With an AR Coating, reflection is reduced from 36% per surface to less than 1% per surface. Constructed of hard, durable first-surface dielectric optical coatings on optical-quality germanium substrates, these filters will withstand cleaning and handling associated with any high-quality optical component. For your convenience and economy, we offer these filters in two standard sizes: 25 mm and 50 mm dia. However, we can produce custom sizes and shapes, as well as custom optical characteristics.

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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.

We also offer plano-convex lenses made of BK7 and CaF2 (Calcium Fluoride) and thin UV FS lenses, designed for applications with ultrashort pulses.