Circuit for controlling the differential output power of a semic

Details Circuit for controlling the differential output power of a semic Circuit for controlling the differential output power of a semic

1977-12-05

1979-12-04

Davie, James W.

Oscillators

Molecular or particle resonant type

307312, H01S 313

Patent

active

041774361

ABSTRACT:
The apparent differential output power or quantum efficiency of a semiconductor laser, such as a double heterostructure laser diode, is reduced by means of a circuit which shunts the laser and includes a threshold device. The I-V characteristic of the shunt circuit intersects that of the laser at V.sub.x such that at voltages below V.sub.x the current through the laser exceeds that through the shunt, and conversely above V.sub.x. Specific embodiments of the shunt circuit include a resistor in series with either a zener diode or one or more forward-biased conventional diodes.

REFERENCES:
patent: 3898588 (1975-08-01), Skagerlund
patent: 4015150 (1977-03-01), Jones
patent: 4086503 (1978-04-01), Fox et al.
R. W. Campbell et al; Semiconductor Diode Lasers, 1972, pp. 75-81.
Dawson, "Shunt diode extends linear range of LED" Electronics, Nov. 10, 1977, p. 119.

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