Stabilization circuit for radiation emitting diodes

Details Stabilization circuit for radiation emitting diodes Stabilization circuit for radiation emitting diodes

1975-02-18

1976-03-23

Sikes, William L.

Oscillators

Molecular or particle resonant type

331 945H, H01S 313

Patent

active

039463354

ABSTRACT:
A particularly important factor limiting the reliability of diode lasers is the catastrophic mirror damage which occurs when the radiated output exceeds a critical value. Experience has shown that this occurs as a result of fluctuations in the drive current, especially in high efficiency diodes. To avoid such damage, a portion of the output radiation from a diode laser, located in the collector circuit of a common emitter drive transistor, is coupled back to a photodetector, located in the base-emitter circuit of the transistor. The resulting negative feedback tends to stabilize the overall operation of the device and maintain the maximum radiated power within safe limits.

REFERENCES:
ueno et al., Color TV Transmission Using Light Emitting Diode. NEC Res. and Devel. No. 35 (Oct. 1974), pp. 15-20.

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