Active optical gyrometer employing a phase conjugation

Details Active optical gyrometer employing a phase conjugation Active optical gyrometer employing a phase conjugation

1988-09-26

1991-04-02

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01C 1964

Patent

active

050043412

ABSTRACT:
The active ring gyrometer comprises a path closed by mirrors (11,12,13) forming a resonant cavity (10) in which is placed a cell (20) containing an optically non-linear medium which permits by a four wave mixture the coherent auto-oscillation of two conjugated counter-rotative waves. The gyrometer further includes two pumping laser beams (31, 32), an optical device (40) for irradiating the medium of the cell, an optical system (50) for causing these two waves to interfere, and a detector (60). The optically non-linear medium and the intensity modulators (70) of the pumping beams permit the production of an optical "bias" which eliminates the blind zone in which the gyrometer is unsuitable for measuring relatively low rates of rotation.

REFERENCES:
patent: 4152071 (1979-05-01), Podgorski
patent: 4396290 (1983-08-01), Morris
patent: 4429393 (1984-01-01), Giuliano
patent: 4525843 (1985-06-01), Diels
patent: 4659223 (1987-04-01), Huignard et al.
Optics Letters, vol. 1, No. 1, Jul. 1977, pp. 16-18; A. Yariv et al.: "Amplified Reflection, Phase Conjugation, and Oscillation in Degenerate Four-Wave Mixing".

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