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Phase shifting thin film multilayers for Michelson interferometers.

S H McCall, J A Dobrowolski, G G Shepherd

|June 18, 2010

Summary

This summary is machine-generated.

Researchers developed novel thin film multilayers creating distinct 90-degree phase shifts for optical Doppler interferometry. This innovation enables advanced upper atmospheric studies using achromatic phase shifts without mirror movement.

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Area of Science:

Optics and Photonics
Thin Film Technology
Atmospheric Science

Background:

Traditional interferometers often require mechanical components for phase shifting, limiting precision.
Achieving achromatic phase shifts is crucial for broadband optical measurements.

Purpose of the Study:

To design and construct novel metal-dielectric thin film multilayers.
To enable a new type of optical Doppler Michelson imaging interferometer.
To achieve achromatic phase shifts for upper atmospheric studies.

Main Methods:

Fabrication of four high reflectance metal-dielectric thin film multilayers.
Characterization of phase changes on reflection across the 0.55-0.77 micrometer spectral range.
Integration into an optical Doppler Michelson imaging interferometer.

Main Results:

The multilayers successfully produced phase shifts differing by 90 degrees within the specified spectral range.
Demonstrated the capability for achromatic phase shifts.
Established the foundation for a new class of Doppler interferometers.

Conclusions:

The developed thin film multilayers are effective for creating precise, achromatic phase shifts.
This technology facilitates advanced optical Doppler interferometry for atmospheric research.
Eliminates the need for mirror motion in achieving phase shifts, simplifying instrument design.