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Proceedings Paper

Radiation Pattern Of A Laser Diode Collimator As A Function Of Driving Current And Frequency
Author(s): J. Cabrita Freitas; F. Carvalho Rodrigues; V. M. Silvestre; Rogerio D. Prina; L. Cadete; Mateus Da silva
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Paper Abstract

To write messages with diode lasers they are current driven. The words correspond to different impulse packets. The size of the pulses and the repetition rate are variables which are organized to suit the needs to convey a particular phrase. The radiation pattern of a diode laser is influenced by both current and pulse signal and repetition rate. The emitted light is structured in a way that the area where the message can be read varies strongly. This is used to make some messages reach into wider areas and some messages into more confined space. This paper shows the results pertaining a collimator for two types of pulse sizes and two different messages. One which is aimed very precisely and the other which is meant to cover a larger portion of space. The diagrams of spot size and its evolution through space are presented. As an example and for the best situation as regards our application the area of the narrow beam passes through a minimum along its propagation path. Also changes in the elliptical orientation of the pattern are reported.

Paper Details

Date Published: 22 June 1989
PDF: 9 pages
Proc. SPIE 1043, Laser Diode Technology and Applications, (22 June 1989); doi: 10.1117/12.976384
Show Author Affiliations
J. Cabrita Freitas, LNETI (Portugal)
F. Carvalho Rodrigues, LNETI (Portugal)
V. M. Silvestre, EID (Portugal)
Rogerio D. Prina, INDEP (Portugal)
L. Cadete, EME (Portugal)
Mateus Da silva, EME (Portugal)

Published in SPIE Proceedings Vol. 1043:
Laser Diode Technology and Applications
Luis Figueroa, Editor(s)

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