Laser gyro with phased dithered mirrors

Details Laser gyro with phased dithered mirrors Laser gyro with phased dithered mirrors

G - Physics

01

C

345/10

G01C 19/64 (2006.01) G01C 19/70 (2006.01) H01S 3/083 (2006.01)

Patent

CA 1180795

ABSTRACT OF THE DISCLOSURE Disclosed herein is a ring laser gyroscope having two oppositely traveling laser beams and is provided with mechanically dithered mirrors at its three or four reflection points. At least two of the mirrors are mounted for movement in and out as the result of the expansion and contraction of stacks of piezoelectric elements associated with these mirrors. These mirrors are thus dithered, i.e. oscillated in and out, in phased relationship with one another so that the total length of the laser cavity is held at a fixed number of wave- lengths, but the laser beam translates back and forth across the surfaces of the mirrors. By this technique, the undesired phenomenon of lock-in at low rotation rates of the gyroscope is avoided, without the need for special optical or magnetic structures in the path of the laser beam.

457634

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