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2010 topical meeting on optical interference coatings: manufacturing problem.

J A Dobrowolski1, Li Li, Michael Jacobson

  • 1National Research Council, Ottawa, Ontario, Canada. dobrowolski@magma.ca

Applied Optics
|April 5, 2011
PubMed
Summary

This study evaluated filters designed for specific transmittance values across multiple wavelength bands. Several manufactured filters closely approached the target optical performance specifications.

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Area of Science:

  • Optical Engineering
  • Materials Science
  • Thin Film Technology

Background:

  • The telecommunication industry frequently requires optical filters with precise transmittance characteristics.
  • Designing and manufacturing such filters presents significant engineering challenges.
  • The 2010 Manufacturing Problem focused on creating filters for specific transmittance values in the visible spectrum.

Purpose of the Study:

  • To assess the performance of filters produced by participants in the 2010 Manufacturing Problem.
  • To compare manufactured filter transmittances against predefined specifications.
  • To evaluate the effectiveness of various design and manufacturing approaches for optical filters.

Main Methods:

  • Participants were tasked with producing filters with target normal incidence transmittances of 0.001, 0.01, 0.1, and 0.96.

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  • Filters were designed to operate within four distinct 60 nm wide bands between 400 and 700 nm.
  • Filter transmittances were independently verified by two separate laboratories.

    • Main Results:

    • Nine groups submitted 11 distinct filters, with layer counts ranging from 28 to 678.
    • Total metric thicknesses of the filters varied from 4,038 to 22,513 nm.
    • Several submitted filters demonstrated performance metrics closely aligning with the specified transmittance values.

    Conclusions:

    • The manufacturing problem highlighted the feasibility of producing complex optical filters meeting stringent requirements.
    • The results indicate progress in thin-film filter design and fabrication techniques.
    • The performance of the submitted filters suggests a high level of expertise among participants in optical filter manufacturing.