Ring laser including reflecting mirror with phase rotating garne

Details Ring laser including reflecting mirror with phase rotating garne Ring laser including reflecting mirror with phase rotating garne

1982-04-15

1985-09-10

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350377, 356351, G01C 1964

Patent

active

045402841

ABSTRACT:
A ring laser having at least three corner mirrors, of which one carries a ferromagnetic garnet layer on a substrate and is coated with a plurality of interference layers and magnetized at right angles to the ferromagnetic garnet layer. The ring laser is designed in such a way that the corner mirror which carries the ferromagnetic garnet layer acts in reflection as a Faraday cell and, in particular, in that the ferromagnetic garnet layer is subjected to circularly polarized radiation. The circularly polarized radiation may be produced by arranging in front of the corner mirror which carries the ferromagnetic garnet layer a .lambda./4 retarding plate. Another possibility consists in providing those corner mirrors which in the radiation path are adjacent to the corner mirror which carries the ferromagnetic garnet layer with a plurality of interference layers which are arranged in such a way that circularly polarized radiation is converted into linearly polarized radiation by means of a 90.degree. phase shift and vice versa.

REFERENCES:
patent: 4141651 (1979-02-01), Smith et al.
patent: 4195908 (1980-04-01), Kestigian et al.
patent: 4222668 (1980-09-01), Henry
patent: 4246549 (1981-01-01), Carter et al.
Southwell, "Multilayer Coating Design Achieving a Broadband 90.degree. Ph Shiff", Applied Optics, vol. 19, No. 16, Aug. 15, 1980, pp. 2688-2692.

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