Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1977-09-30
1979-01-16
Wayner, William E.
Heat exchange
Movable heating or cooling surface
Rotary drum
62514R, 174 15CA, 250352, H01B 734
Patent
active
041344472
ABSTRACT:
The wave length of an infrared, semiconductor laser diode having an output frequency that is dependent on the diode temperature is maintained substantially constant by maintaining the diode temperature constant. The diode is carried by a cold tip of a closed cycle helium refrigerator. The refrigerator has a tendency to cause the temperature of the cold tip to oscillate. A heater diode and a sensor diode are placed on a thermal heat sink that is the only highly conductive thermal path between the laser diode and the cold tip. The heat sink has a small volume and low thermal capacitance so that the sensing diode is at substantially the same temperature as the heater diode and substantially no thermal lag exists between them. The sensor diode is connected in a negative feedback circuit with the heater diode so that the tendency of the laser diode to thermally oscillate is virtually eliminated.
REFERENCES:
patent: 3195620 (1965-07-01), Steinhardt, Jr.
Frosch Robert A. Administrator of the National Aeronautics and Space
Hillman John J.
Jennings Donald E.
Manning John R.
Marchant Robert D.
Tresansky John O.
Wayner William E.
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