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Anti-Reflection Coatings
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From Edmund Optics Inc.
Optical coatings can be critical in an application. Coatings are used to either increase the transmission of light by reducing back reflections (as in the case of lenses, windows, etc.) or to increase the reflectivity of light (as in the case of mirrors). Different coatings can achieve different results depending upon your application requirements. Coatings are optimized for various regions of the spectrum such as the infrared, the visible, or the ultraviolet. Edmund Optics offers a wide array of both stock and custom coatings anti-reflection (AR) coatings. As light passes through an uncoated glass substrate, approximately 4% will be reflected at each surface. This results in a total transmission of only 92% of the incident light. Applying an AR coating on each surface will increase the throughput of the system and reduce hazards caused by reflections traveling backwards through the system (ghost images). Anti-reflection coatings are especially important if the system contains many transmitting optical elements. Many low-light systems incorporate AR coated optics to allow for efficient use of light. The curve below demonstrates the difference between an uncoated and coated single surface BK7 substrate. The coating used is a 1/4 wave of MgF 2 centered at 550nm. MgF2 has an index of 1.38 at 550nm. Products & Services
Fresnel lenses resemble a planoconvex or planoconcave lens that is cut into narrow rings and flattened. If the steps are narrow, the surface of each step is generally made conical and not spherical.
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Spherical lenses, also known as singlets, are transparent optical components consisting of one or more pieces of optical glass with surfaces so curved that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object. This area includes micro spherical lenses as well.
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Optical lenses are transparent components made from optical-quality materials and curved to converge or diverge transmitted rays from an object. These rays then form a real or virtual image of the object. This area includes micro lenses.
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A diffraction grating uses a substrate with parallel grooves to disperse light into its spectra. Eschelles are included in this area.
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Learn more about Diffraction Gratings
Optical polarizers are optical devices that can transform unpolarized or natural light into polarized light, usually by the selective transmission of polarized rays.
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Learn more about Optical Polarizers
Product Announcements
Topics of Interest
Optical coatings are used to manipulate the reflectance and transmittance of an optical component. Typical coating examples include: Antireflection Coatings which reduce the amount of light reflected...
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6.1. BRIEF HISTORICAL INTRODUCTION
The historical origin of multiple-beam interference was found as early as 1836, when
Airy derived an expression for the multiple-beam interference pattern...
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Edmund manufactures a wide range of precision parabolic, spherical and flat mirrors in our own facility. These products are offered in a variety of metallic coatings to suit all your application...
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How can you tell which side of an optic is coated? Let's say you consult the print and it says Side 1 should be coated. So which is Side 1? Assuming your design team anticipated this question, you...
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2.2. BEAM-SPLITTER
The beam-splitter can take the form of glass plate as shown in Figure 2.4 or a cube. It
is made in such a way that the splitting face reflects the light in appropriate...
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