Radiation Pattern Of A Laser Diode Collimator As A Function Of Driving Current And Frequency

J. Cabrita Freitas; F. Carvalho Rodrigues; V. M. Silvestre; Rogerio D. Prina; L. Cadete; Mateus Da silva

doi:10.1117/12.976384

22 June 1989 Radiation Pattern Of A Laser Diode Collimator As A Function Of Driving Current And Frequency

J. Cabrita Freitas, F. Carvalho Rodrigues, V. M. Silvestre, Rogerio D. Prina, L. Cadete, Mateus Da silva

Proceedings Volume 1043, Laser Diode Technology and Applications; (1989) https://doi.org/10.1117/12.976384
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

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J. Cabrita Freitas, F. Carvalho Rodrigues, V. M. Silvestre, Rogerio D. Prina, L. Cadete, and Mateus Da silva "Radiation Pattern Of A Laser Diode Collimator As A Function Of Driving Current And Frequency", Proc. SPIE 1043, Laser Diode Technology and Applications, (22 June 1989); https://doi.org/10.1117/12.976384

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KEYWORDS

Semiconductor lasers

Collimators

Collimation

Technologies and applications

Laser beam propagation

Cameras

Laser development

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