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Photonics Spectra
Jan 2009
Union Optic Inc.Request Info
An optical isolator made from crystal quartz and BK7 has been introduced by Union Optic Inc. It combines a polarization beamsplitter cube and a λ/4 plate. Incident light is linearly polarized by the beamsplitter and converted to circular polarization by the wave plate. If any part of the emerging beam is reflected back into the isolator, the wave plate converts the reflected beam into a linearly polarized one, perpendicular to the input beam. The beamsplitter cube blocks the beam from returning to the input side of the system.


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crystal quartz
The naturally occurring crystalline form of silicon dioxide. It is slightly birefringent and exhibits rotary dispersion of light rays transmitted along the crystal axis, both right-hand and left-hand forms being known. Quartz transmits light from about 1800 A to 4.5 µm in the infrared. It is very hard and takes a high polish, and has a low thermal expansion coefficient.
optical isolator
Also known as an optical diode, an optical isolator is a device that utilizes the Faraday effect to suppress or redirect backscattered or backreflected light in order to allow light transmission in one direction only. Optical isolators are commonly found in laser cavities.
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