Active multi-stage cavity sensor

Details Active multi-stage cavity sensor Active multi-stage cavity sensor

1992-03-02

1993-10-05

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 92, 372 99, 372101, 372103, H01S 310

Patent

active

052512223

ABSTRACT:
In accordance with the present invention, an optical sensing device and method are provided for processing with extremely low energy requirements. Spontaneous emissions from an excited optical gain medium generate a propagating waveform. Either a spatial modulator or the pattern under investigation modulates the optical wavefront generated by the fluorescing gain medium to impose a first spatial pattern thereon. When the first spatial pattern imposed on the wavefront has duality with another spatial pattern imposed by the other of the pattern under investigation or the SLM, light is directed back along pathways through a cavity defined by the gain medium, a reflector, the SLM, and the object under investigation to induce stimulated emission and eventually resonance in the cavity.

REFERENCES:
patent: 4700368 (1987-11-01), Fukuda et al.
patent: 4715689 (1987-12-01), O'Meara et al.
patent: 4720176 (1988-01-01), Klein et al.
patent: 5038359 (1991-08-01), Pepper et al.

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