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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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High-precision gas refractometer by comb-mode-resolved spectral interferometry.

Lijun Yang1, Yan Li2, Haoyun Wei1

  • 1Key Lab of Precision Measurement Technology & Instrument, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.

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|November 8, 2018
PubMed
Summary
This summary is machine-generated.

We developed an absolute gas refractometer using spectral interferometry for precise optical measurements. This device achieves high accuracy (1.3 × 10⁻⁹) and rapid measurements (10 ms) for real-time gas refractivity monitoring.

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Area of Science:

  • * Physics
  • * Optics
  • * Metrology

Background:

  • * Accurate gas refractivity is essential for optical interferometry, precise optical systems, and pressure standards.
  • * Existing methods may lack the required accuracy or speed for real-time applications.

Purpose of the Study:

  • * To demonstrate an absolute gas refractometer with high accuracy and fast measurement capabilities.
  • * To enable real-time monitoring and compensation of gas refractivity.

Main Methods:

  • * Employed spectral interferometry utilizing a frequency comb and a fiber Fabry-Pérot filtering cavity.
  • * Utilized a high-resolution spectrometer with a virtually imaged phased array, diffraction grating, and near-infrared camera.
  • * Derived group refractivity from spectrally resolved interferograms using fast Fourier transform.

Main Results:

  • * Achieved a combined uncertainty of 1.3 × 10⁻⁹ for ambient air measurements.
  • * Demonstrated a single measurement time of only 10 milliseconds.
  • * Successfully validated the performance with measurements of ambient air.

Conclusions:

  • * The developed absolute gas refractometer offers high accuracy and rapid measurements.
  • * The system is suitable for real-time gas refractivity monitoring and compensation.
  • * This technology advances precision optical measurements and metrology.