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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Beam splitter for a wide-angle Michelson Doppler imaging interferometer.

J A Dobrowolski¹, F C Ho, A Waldorf

¹National Research Council of Canada, Division of Physics, Ottawa, Ontario K1A OR6.

|June 1, 1985

Summary

This study details a hexagonal interferometer beam splitter, achieving an average effective transmittance of approximately 0.23. Performance is stable across polarization states and minor angle variations, with suggestions for improvement.

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Area of Science:

Optics and Photonics
Optical Engineering
Materials Science

Background:

Interferometers require precise beam splitting for optical measurements.
All-dielectric coatings offer advantages in optical performance and durability.
Existing beam splitters may have limitations in specific spectral regions or angles of incidence.

Purpose of the Study:

To design and construct a novel hexagonal interferometer beam splitting prism.
To characterize the optical performance of the beam splitter, focusing on transmittance.
To explore methods for enhancing beam splitter efficiency and adaptability.

Main Methods:

Fabrication of a hexagonal prism with an all-dielectric partially reflecting coating.
Measurement of average effective transmittance in the 0.55-0.75-microm spectral region.
Analysis of transmittance dependence on polarization and angle of incidence.

Main Results:

The designed beam splitter achieves an average effective transmittance of approximately 0.23.
Transmittance shows minimal dependence on the plane of polarization.
Performance remains consistent with small deviations from the 30-degree angle of incidence.

Conclusions:

The hexagonal interferometer beam splitter demonstrates robust optical performance.
The design offers stability and is suitable for specific spectral ranges.
Further improvements and designs for alternative angles of incidence are feasible.