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Updated: Nov 10, 2025

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

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Published on: August 12, 2013

Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads.

Oliver Gerberding¹, Katharina-Sophie Isleif²

¹Institute of Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany.

Sensors (Basel, Switzerland)

|April 3, 2021

Summary

This summary is machine-generated.

We developed a compact optical head for wide-range, low-noise displacement sensing using deep frequency modulation interferometry (DFMI). Our method effectively minimizes ghost beam interference, enhancing phase readout linearity for precise measurements.

Keywords:

displacement sensing ghost beams laser interferometry

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Area of Science:

Optical Engineering
Metrology
Interferometry

Background:

Compact optical head designs are crucial for advanced displacement sensing.
Deep frequency modulation interferometry (DFMI) offers wide-range, low-noise measurement capabilities.
Ghost beams generated in interferometers can degrade phase readout linearity.

Purpose of the Study:

To present a novel compact optical head design for DFMI.
To investigate and mitigate the impact of ghost beams on DFMI phase readout.
To enhance the linearity and accuracy of displacement sensing.

Main Methods:

Utilized a quasi-monolithic component with cube beamsplitters for an on-axis beam topology.
Investigated ghost beam coupling into the DFMI phase readout scheme.
Implemented an adjusted phase estimation algorithm using balanced detection and signal orthogonality.

Main Results:

The compact optical head maintains constant angular alignment in air and vacuum.
The adjusted algorithm effectively reduced ghost beam interference.
Achieved improved phase readout linearity in DFMI.

Conclusions:

The presented compact optical head design is suitable for wide-range, low-noise displacement sensing.
The implemented algorithmic adjustments successfully mitigate ghost beam effects in DFMI.
This work advances DFMI performance for high-precision metrology applications.