SURFACE-MODE COUPLING IN GAAS ALGAAS LASER-DIODES - A NEW CONCEPT FORA SINGLE LASER MODE EMISSION/

We present a new concept for a single mode laser diode. This concept i s based on the strong coupling between the laser mode propagating in t he active region and a surface mode on top of the laser diode. By this we achieve both a single-mode-like operation and a surface emission. We present a model which explains qualitatively the emission spectrum and which allows an optimization with respect to real single mode oper ation. The major advantage of this type of laser diode is its simple f abrication. The device utilizes the well established technique of the conventional striped laser and requires no regrowth.