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Beamsplitters Reducing The Loss Of Light Due To The Absorption Of The Reflective Coating
Sep 26, 2017

ABeamsplittersis an optical device that splits a beam of light into two beams or more beams, which is a critical part of most interferometers. Usually composed of a metal film or a dielectric film

The most common shape is a cube, made of two triangular glass prisms, which are glued together on a substrate using polyester, epoxy, or polyurethane-based adhesives. The thickness of the resin layer is adjusted so that half of the (certain wavelength) of the light incident through a "port" (i.e., the cube face) is reflected and the other half continues to be transmitted due to the total internal reflection. Polarization beamsplitters such as the Wollaston prism use birefringent materials to divide the light into polarized beams.

Another design is the use of semi-silver mirror, a glass or plastic, transparent thin metal coating, and now usually aluminum vapor deposition of aluminum. The thickness of the sediment is controlled so that the portion (usually half) of the light incident at the angle of 45 degrees and not absorbed by the coating is transmitted and the rest is reflected. A very thin half-silver mirror for photography is often called a pellicle. In order to reduce the loss of light due to the absorption of the reflective coating, a so-called "Swiss cheese"Beamsplittershas been used. Initially, these are perforated highly polished metal pieces to achieve the desired reflection and transmittance. Thereafter, the metal is spilled onto the glass to form a discontinuous coating, or a small area of the continuous coating is removed by chemical or mechanical action to produce a very literally "half silver" surface.

Instead of a metal coating, a dichroic optical coating may be used. Depending on its characteristics, the ratio of reflection and transmission will vary as a function of the wavelength of the incident light. The spectroscope is used for some elliptical reflective spotlights to disperse unwanted infrared (thermal) radiation, as well as output couplers in the laser structure.

The thirdBeamsplittersis a dichroic mirror prism assembly that uses a dichroic optical coating to divide the incident beam into a plurality of different output beams. This device is used for three-vane color TV cameras and three-color color printing film cameras. It is currently used for modern three CCD cameras. The optically similar system is used in reverse as a beam combiner in a three-disc projector where light from three separate monochrome LCD displays is combined into a single full-color image for projection.

TheBeamsplittersfor a single-mode fiber for a PON network uses a single-mode behavior to segment the beam. The splitter is "spliced" by connecting the two fibers to X.

With a lens and an exposure point to shoot the stereoscopic image of the mirror or prism arrangement, sometimes referred to as the "beam splitter", but this is a misuse of the phenomenon, because they are actually a pair of periscopes, refraction The light is not coincident with the. In some very rare stereoscopic photographic attachments, mirrors or prism blocks are similar in function to the beamer's implementation, the superimposed theme from two different angles through the color filter allows direct production of embossed 3 d images, or by quick alternating blinds Order field 3D video.

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