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Beamsplitters The Light That Is Refracted Is Not Coincident
Nov 06, 2017

A Beamsplitters is an optical device that divides a beam of light into two beams of light or multiple beams, which is a key part of most interferometers. Usually composed of a metal film or a dielectric film.

The most common shape is the cube, made of two triangular glass prisms, which are glued together on the substrate with polyester, epoxy or polyurethane adhesives. The thickness of the resin layer is adjusted so that half of the light (that is, a certain wavelength) is reflected through a "port" (i.e., the surface of the cube), and the other half is continued to be transmitted due to all internal reflection. Polarization splitter, such as the Wollaston Prism, uses birefringent materials to separate light into polarized beams.

Another design is to use a semi silver mirror, a piece of glass or plastic, transparent thin metal coating, now usually made from aluminum vapor deposition aluminum. The thickness of the sediment is controlled so that the portion (usually half) of the light Incident at a 45 degree angle and not absorbed by the coating is transmitted and the remainder is reflected. A very thin,Beamsplitters semi silver mirror used for photography is often referred to as a protective film mirror. In order to reduce the loss of light caused by absorption of the reflective coating, the so-called "Swiss cheese" Beamsplitters has been used. Initially, these were perforated highly polished metal sheets to obtain the desired reflectivity and transmittance. The metal is then splashed onto the glass, forming discontinuous coatings, or by chemical or mechanical action to remove the small area of the continuous coating to produce a very literally "half silver" surface.

Instead of a metal coating, you can use a two-color optical coating. According to its characteristics, the ratio of reflection to transmission will vary with the function of the wavelength of the incident light. The spectrometer is used for some elliptical reflection spotlights to disperse unwanted infra-red (heat) radiation and the output coupler in the laser structure.

The third type of Beamsplitters is a two-color mirror prism component that uses a two-dimensional optical coating to divide the incident beam into different spectral output beams. Such devices are used in three-skin tube color TV cameras and tri-color color printing film cameras. It is currently used in modern three-CCD cameras. The optically similar system is used as a beam assembly in a three-LCD projector, where light from three separate monochrome LCD displays is combined into a single panchromatic image for projection.

A single mode fiber splitter for PON networks uses Single-mode behavior to segment the beam. The separator is "spliced" by two fibers to X.

The arrangement of mirrors or prisms, sometimes called "beam separators", using a lens and a exposure point to shoot stereo images is a misnomer, because they are actually a pair of periscope, and the light that is refracted is not coincident.

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