Disclosed is a laser, to be referred to as a "Z-laser", which comprises means that can ensure excitation of a laser mode that has a far field pattern that comes substantially to a focus at a point external to the laser. Typically, a Z-laser is a vertical cavity surface emitting laser (VCSEL) that comprises...http://www.google.de/patents/US5426657?utm_source=gb-gplus-sharePatent US5426657 - Article comprising a focusing semiconductor laser
