Conoptics manufactures a family of free space modular Faraday rotators and interchangeable accessories which can be combined to perform various isolation functions . The unique feature of a Faraday rotator is its nonreciprocity, that is, the fact that the "handedness" of the polarization rotation it imparts on a transmitted beam is dependent on the beam's propagation direction . This capability allows the conception of many clever schemes to manipulate laser light in ways that are otherwise impossible or, at least, much more difficult to implement.
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