Directional control method and apparatus for ring laser

Details Directional control method and apparatus for ring laser Directional control method and apparatus for ring laser

1996-11-01

1998-06-09

Healy, Brian

Coherent light generators

Particular resonant cavity

Folded cavity

372 92, 372 93, 372 98, 372 99, H01S 3083

Patent

active

057646813

ABSTRACT:
An asymmetric feedback structure in a ring laser produces essentially unidirectional lasing. The structure can be dynamic to permit directional control, or can be passive to provide unidirectional lasing in a predetermined direction. Dynamic control is obtained by a dielectric stack in the laser cavity, the stack including multiple layers having complex impedances for reflecting incident light. The amount and direction of reflection is controlled by varying the refractive indices or the absorption coefficients of the materials in the layers to produce cross-coupling for one direction which is different from the other direction. Passive control is obtained by introducing an asymmetry into the propagation path of the laser. This may be in the form of an optical diode structure or a tapered waveguide structure to produce asymmetric cross-coupling of counter-propagating modes of the laser light.

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