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An open source digital servo for atomic, molecular, and optical physics experiments.

D R Leibrandt1, J Heidecker1

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

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|January 3, 2016
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Summary
This summary is machine-generated.

We developed a versatile digital servo for precise laser control in atomic physics. This advanced feedback system enhances laser stability for applications like optical atomic clocks and frequency doubling.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Control Systems Engineering
  • Laser Physics

Background:

  • Precise feedback control of lasers is crucial for advanced experiments in atomic, molecular, and optical physics.
  • Existing control systems may lack the bandwidth, flexibility, or advanced features required for cutting-edge research.

Purpose of the Study:

  • To introduce a general-purpose digital servo system optimized for high-performance laser feedback control.
  • To demonstrate the servo's capabilities in demanding experimental scenarios.

Main Methods:

  • Development of a digital servo with high feedback bandwidth (up to 1 MHz) and low latency (320 ns).
  • Implementation of advanced features including fifth-order loop filters, multiple-input multiple-output (MIMO) control, and automatic lock acquisition.
  • Utilization of a graphical user interface (GUI) for configuration, system monitoring (software oscilloscope), and transfer function analysis.

Main Results:

  • The digital servo achieves high bandwidth and low latency, enabling precise laser stabilization.
  • Successful application demonstrated in two key areas: frequency control for an optical atomic clock using Al(+) ions and cavity length control for laser resonant frequency doubling.
  • The GUI facilitates user-friendly operation and system characterization.

Conclusions:

  • The developed digital servo offers a powerful and flexible solution for laser control in AMO physics.
  • Its advanced capabilities and ease of use make it suitable for a range of demanding applications, advancing precision measurements and experiments.