Laser diode pulse modulation in sensing and materials processing

Martin Berendt; Hugo Barbosa; Job Tomé; Miguel Melo

doi:10.1117/12.2555821

1 April 2020 Laser diode pulse modulation in sensing and materials processing

Martin Berendt, Hugo Barbosa, Job Tomé, Miguel Melo

Proceedings Volume 11356, Semiconductor Lasers and Laser Dynamics IX; 1135617 (2020) https://doi.org/10.1117/12.2555821
Event: SPIE Photonics Europe, 2020, Online Only

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.

Conference Presentation

Citation Download Citation

Martin Berendt, Hugo Barbosa, Job Tomé, and Miguel Melo "Laser diode pulse modulation in sensing and materials processing", Proc. SPIE 11356, Semiconductor Lasers and Laser Dynamics IX, 1135617 (1 April 2020); https://doi.org/10.1117/12.2555821

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