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US 3,941,481 AGranted
Ring laser having elastic wave bias
OwnerCharles John Kramerinventor
Life of this patent
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Abstract
A ring laser having beams traveling in opposite directions and elastic wave biasing means in the form of an element of elasto-optic material through which the beams pass in a common optical path. Beam coupling is reduced by applying elastic waves to the element such that particles of the elastic material vibrate along the common optical path.
Claims10
A ring laser comprising, in combination,
- first means providing a closed optical path;
- second means for providing two laser beams traversing said path coincidently and simultaneously, but in opposing directions;
- third means providing bias of the frequencies of the beams for preventing said beams from becoming coupled together;
- said third means including an element of elastic material through which said path passes, wherein particles of said material define part of said path;
- and force generating means for causing said particles periodically to move elastically in one of said directions, substantially in phase, for increasing the frequency of one of said beams and decreasing the frequency of the other of said beams, by virtue of Fresnel drag.
2 more elements
Dependencies are inferred from the claim text.