Antireflection Coating (AR) • High-Reflection Coating (HR)
When light enters a medium with different optical properties, most notably refractive index, part is reflected and part transmitted. The reflected-to-refracted intensity ratio mainly depends on the refractive index difference, incident polarization, and incidence angle. Each surface of an uncoated glass substrate reflects approximately 4%, leaving total transmission at only 92%. Coating each component increases system throughput and reduces harm from backward reflections and ghost images. Optical coatings modify reflection, transmission, absorption, or polarization. The coated component is generally called a substrate. Coatings are deposited in high vacuum by electron-beam evaporation or ion-assisted deposition (IAD). Materials include metals such as gold, aluminum, silver, and chromium, and semiconductors such as silicon and germanium.
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Large electron-beam evaporation optical coating equipment HCEB-2700
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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
This series was developed for mass-production market needs. Production-proven equipment offers high productivity and the lowest ownership cost for cost-optimized volume production of optical components. It can produce AR, UV/IR cutoff filters, AF, hard coatings, decorative coatings, ITO coatings, bandpass filters and HR coatings. Equipped with an electron gun, pocket-type, kidney-shaped or annular crucibles and an impedance-type evaporation source. Optical or quartz-crystal thickness monitoring enables automatic control of deposition rate and coating processes. Optional RF/Kaufman-type/Hall-type ion sources. AR coatings (substrate glass transmittance >91.5%): in the 420-680nm band, single-sided average transmittance >95% and reflectance less than 0.5% (average); double-sided average transmittance >98% and reflectance less than 0.5% (average). AS/AF coating test standards: initial contact angle 115±5°; steel-wool abrasion test using 0000# steel wool over 10*10mm, 40 strokes/min, load 1Kg: contact angle greater than 100° after 5000 reciprocating rubbing cycles; eraser test using a 6mm-diameter eraser, 25 strokes/min, load 1Kg: contact angle greater than 100° after 2500 reciprocating rubbing cycles. Note: glass test samples must be precision-polished glass specifically for touchscreen cover plates, with a clean, smooth surface.
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Antireflection-coated sapphire window
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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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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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Material: Color Glass Type(Cut-off Glass, Absorption-Selective Glass, Neutral Glass) Dimensional Tolerance: +0.0, -0.1 Thickness Tolerance: ±0.1 mm
Colored glass modifies the spectral characteristics of optical radiation for scientific experiments and industrial applications requiring such changes. Colored-glass filters can be combined to modify the passband or increase attenuation.
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Right-angle prism with broadband antireflection-coated hypotenuse
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Available materials [Series supply]: N-BK7, UV fused silica or other optical glass Dimensional Tolerance [Standards]: +0/-0.2 Dimensional Tolerance [Processing Upper Limit]: +0/-0.05
Right-angle prisms commonly alter optical paths or redirect beams by 90°. Designed with a 90° angle, they produce inverted or reversed left-handed images depending on orientation. Using two together is ideal for image or beam displacement. Also called mirror-image reflecting prisms.
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