Device for stabilizing the optical power of a semiconductor laser.

摘要

The useful optical power of a semiconductor laser (C) leaves by its front face (f1). The monitoring power leaves the rear face (f2), and enters an optical guide (G) formed by the assembly of two parts (22, 23). The guided light falls on the monitoring photodetector (5). The current detected controls the electrical power for controlling (4) the laser (C). Application to the stabilising of a laser for reading an optical disc. <IMAGE>