Charged Particle Sources
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An optical isolator is a device that acts as an optical diode allowing transmission of light in one direction and preventing propagation in the opposite direction. It is primarily used as a component in laser systems to prevent a reflected beam from entering back into the laser cavity that could otherwise induce much instability and eventually a damage of internal laser components. The key element of isolators is the Faraday Rotator, which harnesses the Faraday Effect to rotate the polarized beam under an intense magnetic field. Optical circulators operate on the same principle to isolate light travelling in opposite directions. They usually have multiple ports and ensure that light entering from one port exits from the next causing the light to “circulate”.