Optical gain control device

Details Optical gain control device Optical gain control device

1979-11-19

1982-02-09

Sikes, William L.

Coherent light generators

Particular component circuitry

Optical pumping

372 26, 372 10, G02B 523

Patent

active

043147437

ABSTRACT:
An optical gain control device limits the light intensity incident on a podetector or photomultiplier. A fluorescent medium is interposed between a monitored source of electromagnetic energy and the detector and is irradiated by a local oscillator. The irradiation is absorbed by the fluorescent material which undergoes an electronic transition from the ground state to a first excited state. Photons impinging on the fluorescent material from the monitored electromagnetic source cause another transition to a second, more excited state. When the relaxation occurs from the higher state back to the ground, the material fluoresces. Because the magnitude of the local oscillator irradiation is kept within prescribed limits, the number of ions in the fluorescing material which are brought to the first excited state stay within certain limits. Consequently, the impinging monitored electromagnetic energy cannot excite more ions to the second higher state than were irradiated to the first excited state. Thus, high energy bursts of the monitored electromagnetic energy will not be transmitted to the detection device. Including a blocking filter having one passband which directly receives the monitored electromagnetic energy and another filter having a different passband which is located between the fluorescing material and the detection device, the transmission of dangerous levels of electromagnetic energy is further prevented. Protection of the detection device is automatic and does not depend on any mechanical coaction to assure quick response and long-term high reliability.

REFERENCES:
patent: 3229221 (1966-01-01), Sorokin et al.
patent: 3971951 (1976-07-01), Rikokawa et al.
patent: 4166254 (1979-08-01), Bjorklund

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