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Microcontroller-based locking in optics experiments.

K Huang1, H Le Jeannic1, J Ruaudel1

  • 1Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4 place Jussieu, 75005 Paris, France.

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This summary is machine-generated.

We developed a simple, inexpensive digital locking system using a microcontroller for stable optical experiments. This reconfigurable system automatically stabilizes light beam phases and cavity lengths without external signals.

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Area of Science:

  • Experimental Optics
  • Precision Measurement
  • Control Systems

Background:

  • Optical experiments demand precise control over relative phase stability between light beams.
  • Stabilization of Fabry-Perot cavity lengths is crucial for many optical setups.
  • Existing analog locking systems can be complex and expensive.

Purpose of the Study:

  • To present a simple, inexpensive, and reconfigurable digital locking system for optics experiments.
  • To demonstrate automatic relocking and sequential functioning capabilities.
  • To provide an alternative to conventional analog locking systems.

Main Methods:

  • Development of a stand-alone microcontroller unit programmed in C language.
  • Implementation of various algorithms for fringe locking and optical cavity stabilization.
  • Testing without external modulations or error signals.

Main Results:

  • Successful stabilization of relative phases between light beams.
  • Accurate stabilization of low- and high-finesse optical cavities.
  • Demonstrated automatic relocking and sequential operation.

Conclusions:

  • The presented digital locking system offers a cost-effective and versatile solution for optical experiments.
  • It effectively replaces traditional analog locking systems, enhancing experimental stability and accuracy.
  • The system's reconfigurability and ease of programming in C language make it widely applicable.