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A compact and open-source microcontroller-based rapid auto-alignment system.

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This study introduces a rapid auto-alignment system using a microcontroller, position sensing detectors (PSDs), and piezoelectric mirror mounts to maintain laser beam stability. The system quickly corrects misalignments, achieving maximum fiber coupling efficiency in approximately 10 seconds.

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Area of Science:

  • Optical Engineering
  • Precision Measurement
  • Embedded Systems

Background:

  • Stable laser beam alignment is critical for numerous optical applications.
  • Drifts in laser trajectory can significantly degrade system performance.
  • Existing alignment methods may lack speed and precision.

Purpose of the Study:

  • To develop a microcontroller-based rapid auto-alignment system for laser beams.
  • To demonstrate the system's ability to detect and correct trajectory drifts.
  • To achieve efficient laser coupling into single-mode fiber optics.

Main Methods:

  • Utilized two-dimensional duo-lateral position sensing detectors (PSDs) for beam position detection.
  • Employed mirror mounts with piezoelectric actuators for precise beam steering.
  • Implemented an auto-alignment strategy as a state machine on a microcontroller using FreeRTOS.

Main Results:

  • Developed integrated hardware and software for PSD interfacing and piezoelectric actuator control.
  • Successfully recovered maximum fiber coupling efficiency in approximately 10 seconds.
  • Demonstrated effective alignment correction even from a state of zero coupling efficiency.

Conclusions:

  • The microcontroller-based auto-alignment system offers rapid and precise correction of laser beam drifts.
  • This system significantly improves efficiency in optical setups, particularly for fiber optic coupling.
  • The developed strategy provides a robust solution for maintaining laser beam stability in real-time.