Method and apparatus for reducing rotational bias in a ring lase

Details Method and apparatus for reducing rotational bias in a ring lase Method and apparatus for reducing rotational bias in a ring lase

1990-11-09

1994-12-13

Buczinski, Stephen C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01B 902, H01S 308

Patent

active

053733606

ABSTRACT:
Method and apparatus for reducing rotational bias error in a ring laser. The method includes the steps of varying a portion of an optical path for laser beams that emerge from a ring laser cavity along divergent paths and are subsequently combined along a common path to a detector. The apparatus of one embodiment includes a movable mirror positioned to intercept the laser beams emerging from the ring laser cavity before combination along a common path. The movable mirror may be piezo-electric transducive elements configured to bend on application of a voltage. The piezo-electric elements are provided with a reflective region that is positioned to redirect the laser beams from the ring laser back to an output coupling mirror so that re-reflection from the output mirror redirects the laser beams back into a beam combining optical element. In an alternative embodiment the detector is periodically displaced along an access parallel to the common path of the laser beam. In this embodiment piezo-electric elements are disposed between the beam combining optic and the detector to periodically displace the detector.

REFERENCES:
patent: 3480878 (1969-11-01), Macek
patent: 3867034 (1975-02-01), Aronowitz
patent: 4141651 (1979-02-01), Smith et al.
patent: 4449824 (1984-05-01), Matthews
patent: 4886364 (1989-12-01), Ljung

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