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Proceedings Paper

Laser diode pulse modulation in sensing and materials processing
Author(s): Martin Berendt; Hugo Barbosa; Job Tomé; Miguel Melo
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Paper Abstract

In this work we propose a laser diode pulse modulation algorithm suitable for implementation in microcontrollers. This algorithm overcomes the speed limitations in microcontroller based laser pulse drivers. A feed forward signal is added to a proportional integral and differential (PID) feedback signal after a settling time. The initial feed forward control gives a fast rise time (<5 μs) and the PID feedback ensure immunity to drift for large pulse widths. This algorithm enables a settling time 10 times faster than the PID settling time. The controller is self-learning and updates the feed forward estimator based on the settled feedback control output. The use of pulse width modulation (PWM) for digital to analog conversion scales well to high power laser diodes due to its high efficiency.

Paper Details

Date Published: 1 April 2020
PDF: 5 pages
Proc. SPIE 11356, Semiconductor Lasers and Laser Dynamics IX, 1135617 (1 April 2020); doi: 10.1117/12.2555821
Show Author Affiliations
Martin Berendt, MWTechnologies, Lda (Portugal)
Hugo Barbosa, MWTechnologies, Lda (Portugal)
Job Tomé, MWTechnologies, Lda (Portugal)
Miguel Melo, MWTechnologies, Lda (Portugal)

Published in SPIE Proceedings Vol. 11356:
Semiconductor Lasers and Laser Dynamics IX
Marc Sciamanna; Rainer Michalzik; Krassimir Panajotov; Sven Höfling, Editor(s)

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