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Implementation of a Reference Interferometer for Nanodetection

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Published on: April 26, 2014

Chirped synthetic-wavelength interferometry.

P de Groot, J McGarvey

|October 3, 2009

Summary

This summary is machine-generated.

This study introduces a novel method for precise distance measurement using a chirped synthetic wavelength in a two-color laser interferometer. This technique achieves high accuracy over a significant range without common interferometry complexities.

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Area of Science:

Optics and Photonics
Metrology
Laser Interferometry

Background:

Traditional synthetic-wavelength interferometry often suffers from phase ambiguities and optical complexity.
Accurate distance measurement is crucial for applications in manufacturing, research, and development.

Purpose of the Study:

To demonstrate a novel method for distance measurement by chirping the synthetic wavelength in a two-color laser diode interferometer.
To achieve high absolute accuracy over a substantial measurement range without inherent limitations of conventional techniques.

Main Methods:

Utilizing a two-color laser diode interferometer with a variable synthetic wavelength (chirping).
Employing a fiber-coupled experimental system with a low-power, collimated object beam.
Implementing signal processing to resolve phase without ambiguity.

Main Results:

Achieved an absolute accuracy of 3 micrometers over a 200-millimeter measurement range.
Successfully avoided phase ambiguities and optical complexities typically found in synthetic-wavelength interferometry.
Demonstrated the system's capability with a 25-microW, 0.25-mm-diameter collimated object beam.

Conclusions:

The chirped synthetic wavelength approach offers a robust and accurate method for distance measurement.
This technique is suitable for dimensional gauging and profiling of rough surfaces.
The developed system presents a practical solution for high-precision metrology applications.