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Digital laser frequency and intensity stabilization based on the STEMlab platform (originally Red Pitaya).

T Preuschoff1, M Schlosser1, G Birkl1

  • 1Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany.

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Summary

We developed open-source digital controllers for laser frequency and intensity stabilization using the STEMlab platform. These controllers achieve a 52 kHz linewidth for frequency stabilization and precise intensity control.

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Area of Science:

  • Physics
  • Optical Engineering
  • Control Systems

Background:

  • Laser systems require precise frequency and intensity stabilization for various scientific applications.
  • Existing stabilization methods can be complex or costly.
  • The STEMlab platform offers a flexible and accessible hardware base for developing custom control solutions.

Purpose of the Study:

  • To develop and characterize digital controllers for laser frequency and intensity stabilization.
  • To leverage the STEMlab platform for implementing these controllers.
  • To provide open-source hardware designs for wider accessibility.

Main Methods:

  • Development of analog hardware interfaces compatible with the STEMlab platform.
  • Implementation of digital control algorithms for laser stabilization.
  • Characterization of controller performance, including bandwidth and noise.
  • Demonstration of frequency stabilization on a diode laser system.
  • Implementation of intensity control using an acousto-optic modulator.

Main Results:

  • The developed controllers are limited by the STEMlab system's bandwidth (1.25 MHz) and noise performance.
  • Achieved a frequency-stabilized diode laser system with a linewidth of 52(1) kHz (FWHM).
  • Demonstrated intensity control to the 1 × 10^-3 level with sub-microsecond rise and fall times.

Conclusions:

  • The STEMlab-based digital controllers offer effective solutions for laser frequency and intensity stabilization.
  • The open-source nature of the project promotes accessibility and further development.
  • The controllers meet the demanding requirements for high-precision laser control in scientific research.