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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Real-Time and Meter-Scale Absolute Distance Measurement by Frequency-Comb-Referenced Multi-Wavelength Interferometry.

Guochao Wang1,2, Lilong Tan3, Shuhua Yan4

  • 1High-tech Institution of Xi'an, Xi'an 710025, China. wgc.19850414@163.com.

Sensors (Basel, Switzerland)
|February 8, 2018
PubMed
Summary
This summary is machine-generated.

A novel absolute interferometer uses multi-wavelength and synthetic wavelength interferometry for instant, long-distance measurements. This precise, stable system achieves subwavelength accuracy for applications in manufacturing and space exploration.

Keywords:
absolute distance measurementdirect synthetic wavelength interferometryfrequency combmulti-wavelength interferometrynon-ambiguous range

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Area of Science:

  • Metrology
  • Optical Engineering
  • Precision Measurement

Background:

  • Accurate long-distance measurement is critical for advanced manufacturing and space missions.
  • Traditional interferometry faces limitations in range and ambiguity for absolute distance determination.

Purpose of the Study:

  • To develop a frequency-comb-referenced absolute interferometer for instant, long-distance, and unambiguous measurements.
  • To integrate multi-wavelength interferometry with direct synthetic wavelength interferometry for enhanced performance.

Main Methods:

  • Utilizing a femtosecond laser frequency comb for simultaneous calibration of four wavelengths.
  • Implementing direct synthetic wavelength interferometry with a fifth wavelength to extend the unambiguous measurement range.
  • Performing linearity tests against a He-Ne laser interferometer over a 3 m distance.

Main Results:

  • Achieved subwavelength distance measurement accuracy.
  • Extended the non-ambiguous measurement range to meter-scale using synthetic wavelengths.
  • Demonstrated a residual error of less than 70.8 nm (peak-to-valley) over 3 m.
  • Obtained fractional deviations of approximately 3 × 10⁻⁸ over 10 hours for a 3 m distance.

Conclusions:

  • The developed absolute interferometer provides precise, stable, and long-term distance measurements.
  • The system is suitable for absolute positioning in large-scale manufacturing and space missions.
  • This technology advances the capabilities of optical metrology for demanding applications.