Ultraviolet Optical Isolator Utilizing the KDP-Isomorphs.
Patent, filed 17 Oct 90, patented 9 Jul 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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An ultraviolet optical isolater which utilizes a KDP-isomorph crystal as the optical element is disclosed. In a preferred embodiment, the ultraviolet optical isolator comprises an input polarizer for linearly polarizing an input beam of ultraviolet light in a first plane of polarization means for rotating the plane of polarization of the linearly polarized ultraviolet light from the input polarizer by substantially 45 degrees in a first direction a Faraday rotator including an optical element made of a KDP-isomorph crystal in which the plane of polarization of the rotated linearly polarized ultraviolet light from the rotating means is rotated about an optical axis of the optical element, a plurality of permanent magnets sequentially coupled together with alternating polarities for developing a magnetic field along the optical axis of the optical element in order to cause the optical element to rotate the plane of polarization of the rotated linearly polarized ultraviolet light from the rotating means by substantially another 45 degrees in the first direction to a second plane of polarization substantially orthogonal to the first plane of polarization, and means for moving the optical element so that the optical element is always enclosed by the plurality of permanent magnets and an output polarizer for outputting the ultraviolet light in the second plane of polarization. Author
- Electricity and Magnetism