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Related Experiment Video

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Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Precision interferometry for measuring wavefronts of multi-wavelength optical pickups.

Zongtao Ge1, Takayuki Saito, Minoru Kurose

  • 1Fujinon Corporation 1-324, Uetake, Saitama City, Saitama 330-8624, Japan. zongtao-ge@msv.fujinon.co.jp

Optics Express
|June 4, 2008
PubMed
Summary

A new interferometer simplifies wavefront measurement for multi-wavelength optical pickups using reflection dot pinhole mirrors. This flexible design achieves high numerical aperture measurements and calibrates aberrations effectively.

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Area of Science:

  • Optical Engineering
  • Metrology

Background:

  • Traditional Mach-Zehnder interferometers use transparent pinholes, limiting flexibility and simplicity.
  • Evaluating multi-wavelength optical pickups presents challenges, especially at high numerical apertures (NA).

Purpose of the Study:

  • To develop a novel interferometer for evaluating multi-wavelength optical pickup wavefronts.
  • To create a flexible, simple, and accurate system for optical metrology.

Main Methods:

  • Utilized reflection dot pinhole mirrors instead of transparent pinholes for reference wavefront generation.
  • Implemented a software filter to address the three-beam problem, simplifying optical design.
  • Designed for operation at 405 nm, 650 nm, and 780 nm with NA up to 0.95.
  • Introduced a lens rotation method for calibrating asymmetric aberrations (astigmatism, coma).

Main Results:

  • Achieved a flexible and simple interferometer design suitable for multi-wavelength measurements.
  • Successfully operated at high NA (0.95) across multiple wavelengths.
  • Demonstrated accurate calibration of asymmetric aberrations.
  • Verified system accuracy against commercial Fizeau interferometers, showing good agreement.

Conclusions:

  • The novel interferometer offers a simplified and flexible approach to wavefront measurement for multi-wavelength optical pickups.
  • The system's ability to handle high NA and calibrate aberrations makes it a valuable tool in optical metrology.