CURVED GRATING SURFACE-EMITTING DISTRIBUTED FEEDBACK LASER

摘要

Surface-emitting distributed feedback (SEDFB) lasers (10) having a curved grating (30) with a shape that produces good beam quality. A preferred shape is one for which the grating curves away from the center of the gain region (31) of the laser (10). The use of the curved grating (30) of the present invention produces good beam quality from broad area SEDFB lasers with high power and high efficiency. The present invention overcomes self-induced filament formation and dynamic instabilities that limit achievable beam quality. The present invention provides for a holographic method for fabricating curved gratings (31) for the SEDFB lasers (10) that is consistent with laser batch processing.