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Related Experiment Video

Updated: May 18, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Ultrastable heterodyne interferometer system using a CMOS modulated light camera.

Rikesh Patel¹, Samuel Achamfuo-Yeboah, Roger Light

¹Applied Optics Group, Electrical Systems and Optics Research Division University of Nottingham, University Park, Nottingham, NG7 2RD, UK. eexrp4@nottingham.ac.uk

|October 6, 2012

Summary

This summary is machine-generated.

A new widefield interferometer uses a modulated light camera (MLC) to eliminate phase noise from vibrations. This novel system achieves ultrastable interferograms without common path optics, enhancing measurement precision.

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Area of Science:

Optical physics
Interferometry
Instrumentation

Background:

Widefield interferometers are susceptible to phase noise from environmental factors like vibrations.
Conventional systems often require complex common path optics to mitigate phase instability.
Existing methods struggle to effectively eliminate piston phase contributions.

Purpose of the Study:

To develop a novel ultrastable widefield interferometer.
To eliminate piston phase contributions without common path optics.
To enhance the stability and precision of widefield heterodyne interferometry.

Main Methods:

Utilized a modulated light camera (MLC) with integrated quadrature demodulation circuitry.
Implemented an on-board electronic reference signal derived from MLC pixels.
Employed heterodyne interferometry principles for phase extraction.

Main Results:

Achieved significant reduction in piston phase noise, mitigating vibrations and microphonics.
Demonstrated system stability with mirror motion up to 85 mm/s across a wide frequency range (18 Hz to 20 kHz).
Showed insensitivity to piston phase variations equivalent to object velocities exceeding 3 m/s.

Conclusions:

The novel ultrastable widefield interferometer effectively eliminates piston phase noise.
The system offers high stability and precision without complex common path optics.
This advancement has significant implications for various applications requiring precise optical measurements.