Semiconductor laser device having a light focusing transmission

摘要

A semiconductor laser device includes a laser element and a light transmission body mounted in an integrated structure. The light transmission body is mounted coaxially with the axis of the active region of the laser element and includes a focusing portion arranged about the axis of the body. The refractive index distribution in the focusing portion of the light transmission body is chosen so as to minimize undesired oscillation modes in the output light beam and to provide an output beam of substantially circular cross section.