Partly transparent mirror for a ring laser gyro

Details Partly transparent mirror for a ring laser gyro Partly transparent mirror for a ring laser gyro

G - Physics

02

B

88/104, 88/113

G02B 5/08 (2006.01) G01C 19/66 (2006.01) G02B 5/28 (2006.01) G02B 5/30 (2006.01) H01S 3/08 (2006.01) H01S 3/083 (2006.01)

Patent

CA 1308281

ABSTRACT OF THE DISCLOSURE A ring laser gyro system having a special and improved partly transparent output corner mirror which allows substantially undistorted circularly polarized coherent light beams to be extracted from a ring laser and delivered to a beam detector. The improved mirror sandwiches a non-quarterwave film-stack between two quarterwave, film-stacks, each having alternate high index of refraction and low index of refraction films. The film stacks are positioned on a dimensionally stable, thermally stable, transparent substrate. The improved mirror achieves nearly Zero phase retardation and a Tp/Ts ratio equal to one.

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