Coating Fabry-Perot interferometer plates with broadband multilayer dielectric mirrors

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• High-reflectance dielectric coatings are crucial for optical instruments like Fabry-Perot interferometers.
• Achieving uniform and reproducible coatings with precise layer thicknesses presents a significant manufacturing challenge.

Purpose of the Study:

• To describe the development and characterization of broadband multilayer dielectric coatings.
• To detail techniques for producing highly uniform coatings suitable for air-spaced Fabry-Perot interferometers.
• To present a method for optically monitoring layer thicknesses during coating deposition.

Main Methods:

• Fabrication of broadband multilayer dielectric coatings.
• Application of techniques for achieving high uniformity in coatings.
• Detailed description of an optical monitoring method for layer thickness control.
• Characterization of coating reflectance and reproducibility.

Main Results:

• Development of broadband multilayer dielectric coatings with reflectances around 0.9.
• Successful implementation of techniques for producing highly uniform coatings.
• Demonstration of an optical monitoring method yielding good agreement between design and finished coating specifications.
• Attainment of good reproducibility in the coating process.

Conclusions:

• The described optical monitoring method effectively controls layer thickness for uniform dielectric coatings.
• The developed coatings are suitable for air-spaced Fabry-Perot interferometers due to high reflectance and uniformity.
• The techniques ensure reliable and reproducible fabrication of high-performance optical coatings.