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Proceedings Paper

Investigations on beam profiles and beam propagation of astigmatic laser diodes with an optical near-field microscope
Author(s): Chunqing Gao; Ari T. Friberg; R. Motzkus; Norbert Reng
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Paper Abstract

For industrial applications of high power laser diodes it is of interest to know the focal region of the laser beam for efficient fiber coupling and material processing. Similar questions also occur with laser diodes for the optical communication industry. For efficient fiber coupling the beam shall be round and its waist situated at the fiber entrance. With an optical near field microscope we investigated the near field at the facettes of the laser diode and documented the change when leaving the laser diode in micrometer steps. It is a non paraxial laser beam. The beam radii can be evaluated from the intensity profiles and so the caustic curve of the laser beam in x- and y- direction, which in the ideal case yields a hyperbolic propagation law.

Paper Details

Date Published: 18 August 1997
PDF: 11 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281123
Show Author Affiliations
Chunqing Gao, Beijing Institute of Technology and Technical Univ. of Berlin (China)
Ari T. Friberg, Univ. of Joensuu (Finland)
R. Motzkus, Laser- und Medizin-Technologie gGmbH Berlin (Germany)
Norbert Reng, Laser- und Medizin-Technologie gGmbH Berlin (Germany)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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