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Multibeam interferometric methods for measuring very small periodic displacements.

J I Burov, D V Ivanov

|June 18, 2010

Summary

This study demonstrates measuring extremely small periodic displacements (SPD) using a multibeam Fabry-Perot interferometer. Heat noise was identified as the primary limitation to sensitivity at room temperature.

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Area of Science:

Optics and Photonics
Metrology
Condensed Matter Physics

Background:

Measuring minute displacements is crucial for various scientific and technological applications.
Fabry-Perot interferometers offer high sensitivity for displacement measurements.
Understanding noise sources is essential for improving measurement precision.

Purpose of the Study:

To investigate the capability of a multibeam Fabry-Perot interferometer for measuring very small periodic displacements (SPD).
To analyze the dominant noise factors affecting measurement sensitivity at room temperature.

Main Methods:

Utilized a multibeam Fabry-Perot interferometer setup.
Employed a high-gain photomultiplier and a powerful laser.
Analyzed noise contributions including heat fluctuations, shot effect, and radiation pressure noise.

Main Results:

Achieved measurement of SPD on the order of 10(-19) meters at room temperature.
Identified thermal noise from mirror surfaces as the most significant limiting factor for sensitivity.

Conclusions:

The multibeam Fabry-Perot interferometer is a viable tool for detecting ultra-small periodic displacements.
Thermal noise is the critical factor to address for enhancing measurement sensitivity in such systems at room temperature.

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