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Related Experiment Video

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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A simple and versatile phase detector for heterodyne interferometers.

A Mlynek1, H Faugel1, H Eixenberger1

  • 1Max Planck Institute for Plasma Physics, Garching 85748, Germany.

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|March 3, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a simple, low-cost method for measuring the phase of electrical signals using analog pre-processing and a standard analog-to-digital converter (ADC). This technique simplifies phase reconstruction for applications like heterodyne interferometry.

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Area of Science:

  • Electrical Engineering
  • Physics
  • Optical Engineering

Background:

  • Measuring the relative phase of sinusoidal electrical signals is crucial in heterodyne interferometry and other applications.
  • Detectors often need to track phase differences exceeding 2π, requiring multi-radian capabilities.

Purpose of the Study:

  • To present a simplified, hardware-efficient approach for measuring the relative phase of sinusoidal electrical signals.
  • To demonstrate an alternative method that reduces the performance requirements of analog-to-digital converters (ADCs).

Main Methods:

  • Signals are pre-processed using simple analog circuitry.
  • Two resulting voltages are digitized using a standard 2-channel ADC with a low sampling frequency.
  • Phase reconstruction is performed via software.

Main Results:

  • The developed method utilizes few low-cost hardware components.
  • It enables phase measurement with an ADC sampling frequency significantly lower than the signal frequency.
  • Successfully applied to measure the relative phase of 40 MHz sinusoids in a two-color interferometer.

Conclusions:

  • The presented approach offers a simple and cost-effective solution for phase measurement.
  • It significantly lowers hardware requirements, making it accessible for various applications.
  • The method is validated through its application in a complex interferometry system.