Conceptual design and implementation of a microcontroller for the projection of laser and lighting effects in smart environments

Ilchev, Svetozar; Otsetova-Dudin, Ekaterina

doi:10.1145/3546118.3546140

Cited by 2 publications

(1 citation statement)

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“…The more common assumption in this type of solution is precisely measuring and controlling the temperature [14] and/or supply current [15], thereby, resulting in a highly stable optical power. The advantage of these types of solutions is that the system can be implemented by using microcontrollers and commercial current drivers, along with thermal sensors, to operate and safeguard the laser [16,17]. Although these drivers can achieve high precision in emitted optical power, they are unable to compensate for changes in optical power caused by aging or internal laser issues because they do not measure the actual laser emitted power.…”

Section: Introductionmentioning

confidence: 99%

Design and Stability Analysis of a Digital Automatic Power Control Based on a PI Controller for Laser Drivers

et al. 2023

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Laser diodes are widely used in research and industrial applications in areas such as measurements, communications and health. In most of these applications, stability in the emitted light power is required. This can be realized by modifying the internal parameters, such as the current supply, by using an analog automatic power control (APC). This research presents the design and analysis of a feedback laser driver (digital APC system) based on a proportionall–integral (PI) controller. The controller’s theoretical design acting on the supply current in a laser was obtained by algebraically solving the general equations of a PI controller over a laser described as a steady-state system. The required steady-state model can be determined from the lightl–current curve obtained either from the laser data sheet or experimentally. A posterior numerical analysis shows that the proportional gain of the PI controller is only limited numerically by the reciprocal of the slope efficiency of the laser when the characteristic time of the system is greater than the sampling period. Finally, the APC model was tested in an experimental setting using a laser diode ADL-65052TL at several temperatures. The results show that the proposed relations for the proportional gain and the integral time are valid, achieving the desired power stability with a drift of less than 0.1%.

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