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Widefield heterodyne interferometry using a custom CMOS modulated light camera.

Rikesh Patel1, Samuel Achamfuo-Yeboah, Roger Light

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Researchers developed a new modulated light camera (MLC) for widefield heterodyne interferometry. This system achieves high-accuracy phase measurement, offering significant advantages for imaging applications.

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Area of Science:

  • Optics and Photonics
  • Interferometry
  • Image Sensor Technology

Background:

  • Heterodyne interferometry is crucial for precise phase measurements.
  • Traditional methods can be limited in field of view and complexity.
  • Modulated light imaging offers potential for enhanced phase retrieval.

Purpose of the Study:

  • To describe a novel method for widefield heterodyne interferometry.
  • To introduce a custom CMOS modulated light camera (MLC) for this purpose.
  • To evaluate the performance and advantages of the developed system.

Main Methods:

  • Utilized a custom CMOS modulated light camera (MLC) with analogue quadrature demodulation.
  • Employed a Mach-Zehnder interferometer incorporating an acousto-optical frequency shifter (AOFS).
  • Acquired widefield fringe patterns using the prototype MLC.

Main Results:

  • Successfully acquired widefield heterodyne interferograms.
  • Demonstrated phase measurement accuracy of ±6.6°.
  • Presented widefield images of fringe patterns captured by the MLC.

Conclusions:

  • The developed MLC provides a robust method for widefield heterodyne interferometry.
  • The system offers advantages in acquiring large-field-of-view phase information.
  • This technique enhances capabilities in optical metrology and imaging.