Optical feedback isolator

Details Optical feedback isolator Optical feedback isolator

1988-05-16

1989-07-04

Arnold, Bruce Y.

350320, G02B 530, G02B 2728

Patent

active

048445932

ABSTRACT:
Method and apparatus for isolating optical feedback in a laser interferometer having a laser light source from which a linear polarized outgoing laser beam of certain polarization orientation is derived. The interferometer also redirects the outgoing laser beam to form a return laser beam directed to a receiver. The outgoing laser beam and the return laser beam are physically close and are substantially parallel. The linearly polarized outgoing laser beam is converted to circular polarization. A portion of the circularly polarized return laser beam directed toward the laser light source is converted back to linear polarization with polarization orientation orthogonal to the polarization orientation of the outgoing laser beam. A portion of the circularly polarized return laser beam directed toward the receiver is converted back to linear polarization with polarization orientation being substantially the same as the polarization orientation of the outgoing laser beam. The portion of the return laser beam with polarization orientation orthogonal to the polarization orientation of the outgoing laser beam is directed away from the laser light source, and the portion of the return laser beam with polarization orientation substantially the same as the polarization orientation of the outgoing laser beam is directed toward the receiver.

REFERENCES:
patent: 3635552 (1972-01-01), de Lang
Brown, N. "Frequency Stabilized Lasers: Optical Feedback Effects," Applied Optics, vol. 20, No. 21, pp. 3711-3714, Nov. 1981.

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