Semiconductor laser device for the generation of a periodic refractive index distribution and/or periodic gain distribution

摘要

To reduce the longitudinal modes generated by a semiconductor laser a homogeneous optical grating integrated in the laser can be used. In principle these types of laser containing an optical grating to reduce the modes emit two longitudinal modes. The periodic semiconductor structure consisting of the layers 10 and 11 and constructed by connecting in series at least two semiconductor materials with energy gaps E1 and E2 and refractory indices n1 and n2 (E1 E2, n1 n2) can be operated as:… - a passive interference filter,… - an active, partly amplifying interference filter… - an optical narrow-band amplifier… - a single-mode laser emitting only a single mode. …IMAGE…