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Related Experiment Video

Updated: May 14, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

High-accuracy sinusoidal phase-modulating self-mixing interferometer using an electro-optic modulator: development

Wei Xia¹, Ming Wang, Zhenyu Yang

¹Jiangsu Key Laboratory on Opto-electronic Technology, Department of Physics Science and Technology, Nanjing Normal University, Nanjing, China.

|February 7, 2013

Summary

This summary is machine-generated.

A novel interferometer using a phase-modulating He-Ne laser achieves nanometer-accuracy displacement measurement. Its performance, validated against a commercial system, demonstrates feasibility for precise real-time measurements.

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Last Updated: May 14, 2026

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Area of Science:

Optics and Photonics
Metrology

Background:

Accurate displacement measurement is crucial in various scientific and industrial applications.
Existing interferometers face limitations in real-time measurement accuracy and range.

Purpose of the Study:

To develop a new interferometer for real-time displacement measurement with nanometer accuracy.
To introduce the operational principle and signal processing techniques of the developed system.

Main Methods:

Utilized a sinusoidal phase-modulating Helium-Neon (He-Ne) laser with weak optical feedback.
Implemented a novel signal processing method for displacement calculation.
Compared performance against a commercial dual-frequency interferometer across different displacement ranges.

Main Results:

The developed interferometer demonstrated nanometer-level accuracy in real-time displacement measurements.
Experimental results showed excellent agreement in average errors and standard deviations compared to a commercial interferometer.
Detailed analysis of resolution and multiple feedback effects confirmed the system's viability.

Conclusions:

The developed phase-modulating laser interferometer is a reasonable and feasible solution for high-accuracy, real-time displacement measurement.
The system offers a promising alternative for applications requiring precise metrology.
Further investigation into resolution and feedback effects supports its practical implementation.