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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Absolute metrology by phase and frequency modulation for multiwavelength interferometry.

Konstantinos Falaggis1, Catherine E Towers

  • 1School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK. falaggis@physics.org

Optics Letters
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel fiber interferometer for precise absolute distance measurements using modulated fiber Bragg gratings. This technique enhances accuracy for ultrahigh dynamic range metrology over several meters.

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Area of Science:

  • Optoelectronics
  • Metrology
  • Fiber Optics

Background:

  • Accurate absolute distance measurements are crucial in various scientific and industrial applications.
  • Traditional methods using multiple wavelengths or wavemeters face limitations in accuracy and dynamic range.
  • Fiber interferometers offer potential for high-resolution measurements but require advanced techniques for absolute determination.

Purpose of the Study:

  • To present a novel fiber interferometer design for absolute distance measurements.
  • To enhance the accuracy of beat wavelength generation using fiber Bragg gratings.
  • To demonstrate the potential for ultrahigh dynamic range metrology with low system complexity.

Main Methods:

  • Utilizing a fiber interferometer with fiber laser sources and narrow-bandwidth fiber Bragg gratings.
  • Generating a series of beat wavelengths through sinusoidal strain modulation of the fiber Bragg grating.
  • Comparing the accuracy of beat wavelengths with conventional optical spectrum analyzers and wavemeters.

Main Results:

  • Achieved beat wavelengths of 254.74 mm over a 200 mm optical path difference.
  • Measured beat wavelengths of 27.4 m over a 3.8 m optical path difference.
  • Demonstrated improved accuracy in beat wavelength determination compared to conventional methods.

Conclusions:

  • The developed fiber interferometer offers improved accuracy for absolute distance measurements.
  • The technique shows potential for ultrahigh dynamic range metrology (several meters) with subfringe resolution.
  • The system's low complexity makes it suitable for practical metrology applications.