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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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NQontrol: An open-source platform for digital control-loops in quantum-optical experiments.

Christian Darsow-Fromm1, Luis Dekant1, Stephan Grebien1

  • 1Institut für Laserphysik und Zentrum für Optische Quantentechnologien der Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.

The Review of Scientific Instruments
|April 9, 2020
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Summary

NQontrol is a digital feedback system for precise optical resonator control. It achieves high-speed, simultaneous feedback loops, outperforming analog systems for advanced physics experiments.

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Area of Science:

  • Physics
  • Optical Engineering
  • Control Systems

Background:

  • Precise control of optical resonators is crucial for experiments like Pound-Drever-Hall locking.
  • Existing analog feedback systems can be complex and lack flexibility.
  • Digital solutions offer potential for improved performance and ease of use.

Purpose of the Study:

  • To introduce NQontrol, a novel digital feedback-control solution.
  • To demonstrate the system's capability in achieving Pound-Drever-Hall lock on an optical resonator.
  • To compare the performance of NQontrol against a traditional analog feedback system.

Main Methods:

  • Implementation of NQontrol on the ADwin platform, providing eight simultaneous feedback loops at a 200 kHz sampling frequency.
  • Inclusion of five second-order filtering sections per channel for flexible feedback loop shaping.
  • Demonstration using Pound-Drever-Hall locking of an optical resonator.

Main Results:

  • Successful Pound-Drever-Hall lock of an optical resonator was achieved using the NQontrol system.
  • Performance comparison showed NQontrol's effectiveness against an analog reference implementation.
  • The system offers high-speed, multi-channel feedback with advanced filtering capabilities.

Conclusions:

  • NQontrol provides a flexible, high-performance digital feedback-control solution for optical systems.
  • The system is user-friendly, with Python support and a web-based GUI, while retaining open-source flexibility.
  • NQontrol represents a significant advancement for precision control in optical experiments.