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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Related Experiment Video

Updated: May 14, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Sensitive interferometry with multimode fibres.

Robert Archibald, Simon Peter Mekhail, Osian Wolley

|April 12, 2025

Summary

This summary is machine-generated.

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.

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Last Updated: May 14, 2025

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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.