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Validating data analysis of broadband laser ranging.

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This study presents an analysis method for broadband laser ranging using dispersive Fourier transforms with standard telecom fiber. The technique accurately measures surface positions despite fiber imperfections, achieving high precision.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Signal Processing

Background:

  • Broadband laser ranging requires precise spectral analysis.
  • Dispersive Fourier transform (DFT) is crucial for high-repetition-rate measurements.
  • Standard telecommunications fiber introduces higher-order dispersion, complicating DFT.

Purpose of the Study:

  • To develop and validate an analysis process for laser ranging data affected by imperfect DFT.
  • To enable high-precision position measurements using readily available fiber optics.

Main Methods:

  • Combining spectral interferometry with DFT using standard telecommunications fiber.
  • Developing a detailed analysis process to interpret ranging signals with dispersion imperfections.
  • Experimental validation of the analysis process over a 27-cm scan.

Main Results:

  • The developed analysis process effectively interprets ranging data from imperfect DFT.
  • Experimental validation demonstrated a measurement accuracy of 50 μm.
  • Achieved a root-mean-square precision of 4.7 μm for static position measurements.

Conclusions:

  • The analysis method successfully compensates for higher-order dispersion in DFT-based laser ranging.
  • This approach allows for accurate and precise surface position measurements using standard fiber optics.
  • The validated technique offers a practical solution for high-repetition-rate metrology.