Halbleiterkristall fuer Laser

摘要

1,046,702. Semi-conductor lasers. LICENTIA PATENT-VERWALTUNGS-G m.b.H. March 18, 1964 [March 19, 1963], No. 11385/64. Heading H1K. [Also in Division H3] A laser comprises a semiconductor crystal having two or more PN junctions Depending upon the current direction either junctions 1, 2 and 3 or junctions 4 and 5 produce coherent radiation. The reverse biased junctions do not block current flow since they act as backward-diode junctions due to the high doping level. The junctions may be separated sufficiently to radiate independently or may overlap sufficiently for all the junctions to radiate coherently The junctions may each have a different threshold for laser action. Mirrors may be provided to connect the junctions optically in series or parallel, and mirror coatings may be used to concentrate the radiation in a single direction.