Stabilization circuit for radiation emitting diodes

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

H - Electricity

01

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323/7, 328/114.2

H01S 3/13 (2006.01) H01S 5/068 (2006.01) H01S 5/30 (2006.01) H03F 17/00 (2006.01) H04B 10/155 (2006.01) H01S 5/0683 (2006.01)

Patent

CA 1038939

STABILIZATION CIRCUIT FOR RADIATION EMITTING DIODES Abstract of the Disclosure 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.

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