Coherent light generators – Particular resonant cavity – Folded cavity
Patent
1987-10-01
1995-10-31
Moskowitz, Nelson
Coherent light generators
Particular resonant cavity
Folded cavity
356350, G01C 1964, H01S 304
Patent
active
054636523
ABSTRACT:
The apparatus of this invention uses a rectangular-parallelepiped prism to extract portions of the counterpropagating beams from a ring laser of a gyro. Such prism is easier to build than prisms having other than right angles. One beam bounces within the prism, but it is not perfectly reflected, and a portion of the beam is transmitted to a sensor to control the length of the ring laser cavity. The two beams are combined to produce a heterodyne signal by using two partly transmissive mirrors on two parallel surfaces of the prism, and by positioning a third side surface at a critical angle relative to one of the beams.
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Kirk James F.
Litton Systems Inc.
Martino, Jr. Chester E.
Moskowitz Nelson
Rish L. David
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