Method and apparatus for controlling the intensity of a laser ou

Details Method and apparatus for controlling the intensity of a laser ou Method and apparatus for controlling the intensity of a laser ou

1976-03-10

1978-10-24

Sikes, William L.

Oscillators

Molecular or particle resonant type

346108, 365215, H01S 310

Patent

active

041224094

ABSTRACT:
The output beam of a laser tube is modulated between a maximum intensity (lase) and minimum (no-lase) intensity levels by varying the laser tube current between corresponding values. The device for controlling the output beam comprises a single transistor provided in the current path of the laser tube, the current therethrough being controlled, or modulated, to provide the modulated laser beam. The device is capable of operating in a plurlity of modes. In the preferred mode, an analog signal is coupled to the transistor control circuitry whereby the laser beam intensity is linearly modulated between the maximum and minimum levels to provide a laser beam having grey scale capabilities. In a second operating mode, a digital signal is coupled to the transistor control circuitry whereby the laser beam intensity is modulated to a constant value between minimum and maximum levels.

REFERENCES:
patent: 2965434 (1960-12-01), Downs
patent: 3245083 (1966-04-01), Wilson et al.
patent: 3657707 (1972-10-01), McFarland et al.
patent: 3806762 (1974-04-01), Punis et al.

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