Partially transparent mirror for a ring laser

Details Partially transparent mirror for a ring laser Partially transparent mirror for a ring laser

1989-03-10

1990-02-27

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350164, 350166, G01C 1964

Patent

active

049040839

ABSTRACT:
Provided herein is a ring laser gyro system having a special and improved partially transparent output mirror which provides relatively undistorted circularly polarized coherent light beams to the photo detector and amplifier of the system from the laser cavity thereof. This improved mirror achieves its results by sandwiching a non-quarterwave stack between two quarterwave stacks of multi layer, all of which are coated on a Zerodur substate mirror. The improved mirror achieves nearly Zero phase retardation and a Tp/Ts ratio equal to one.

REFERENCES:
patent: 3382758 (1968-05-01), Wang
patent: 3637294 (1972-01-01), Berthold
patent: 4213705 (1980-07-01), Sanders
patent: 4309075 (1982-01-01), Apfel et al.
patent: 4747666 (1988-05-01), Ishida

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