CORRECTION OF POWER VARIATIONS IN LASER SOURCES

摘要

The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a method of correcting output power variations in a semiconductor laser is provided. According to the method, an output power feedback loop is utilized to generate optical intensity feedback signals representing actual output power of the laser source for discrete portions V1, Vi, Vj of the image signal. Error signals E1, Ei, Ej are generated representing the degree to which actual projected output power varies from a target projected output power for the discrete portions V1, Vi, Vj of the image signal. These error signals E1, Ei, Ej are utilized to apply corrected control signals G1', Gi', Gj' to the gain section of the semiconductor laser for projection of compatible discrete portions V1', Vi', Vj' of the image signal. According to another embodiment of the present invention, a system is provided for generating a projected laser image.