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Sensitive interferometry with multimode fibres
Optics Express
|April 12, 2025
Summary
This study demonstrates an interferometric sensor using multimode optical fibre, enhancing étendue for optical sensing. The novel approach enables high-speed, stand-off laser vibrometry with low power detection.
Area of Science:
- Optical sensing
- Interferometry
- Photonics
Background:
- Traditional interferometric sensors rely on single-mode optical fibres, limiting system étendue.
- Multimode fibres offer higher étendue but are typically incompatible with interferometric techniques.
Purpose of the Study:
- To develop an interferometric sensor utilizing multimode optical fibres.
- To increase the étendue of interferometric sensor systems.
- To enable high-speed, stand-off laser vibrometry.
Main Methods:
- Configuration of an interferometric sensor with multimode optical fibre.
- Application of off-axis holography to recover complex amplitude from speckle patterns.
- Demonstration of stand-off laser vibrometry using the multimode fibre as the sole collection optic.
Main Results:
- Successful implementation of an interferometric sensor using multimode fibre, significantly increasing étendue.
- High-speed recovery of complex amplitude from fibre-transmitted speckle patterns.
- Demonstrated stand-off laser vibrometry with a sensitivity of 0.003 μW and bandwidth exceeding 2300 Hz.
Conclusions:
- Multimode optical fibres can be effectively used for interferometric sensing, overcoming previous limitations.
- Off-axis holography facilitates high-speed data acquisition for fibre-based interferometric sensors.
- The developed system offers a sensitive and versatile solution for stand-off vibration measurement.
