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Optimum asymmetric mirror facet structure for high-efficiency semiconductor lasers

By: Higashi, T.; Ogita, S.; Soda, H.; Kobayashi, H.; Kurakake, H.; Aoki, O.; Okazaki, N.;

1993 / IEEE

Description

This item was taken from the IEEE Periodical ' Optimum asymmetric mirror facet structure for high-efficiency semiconductor lasers ' A design theory for asymmetric mirror facet structure lasers that takes into account the spatial hole burning (SHB) effect along the cavity is presented. It is shown that the SHB effect reduces the external quantum efficiency in asymmetric mirror facet structure lasers, and the front facet reflectivity has an optimum value depending on the internal loss for high-efficiency operation. A slope efficiency of more than 50% has been obtained in lasers based on the new design theory. It is noted that nonuniform current injection is one of the most useful methods for increasing the external quantum efficiency, which is reduced by the SHB effect.<>