FLAECHENEMISSIONS-LASER

摘要

A surface emitting laser comprises two lasing regions 32a, 32b separated by an optical grating which causes the light output from the lasing regions to be emitted normally to the surface. A plurality of such lasers are laterally aligned and coupled together and also have their light output signals combined. This results in greater phase and frequency coherency and narrower and reduced amplitude sidelobes. Preferably, not more than two lasers are longitudinally aligned along the same axis for still greater coherency compared with adding the light output signals of more than two longitudinally aligned lasers. The lasers can be of the DH-LOC type or of the QW type. <IMAGE>