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Related Concept Videos

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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: Jun 19, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Interferometer using a 3 x 3 coupler and Faraday mirrors.

J Breguet, N Gisin

    Optics Letters
    |October 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel interferometric setup using passive components like a 3x3 coupler and Faraday mirrors offers polarization-fading-free operation. This design is ideal for sensing time-dependent signals with LEDs.

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    12:14

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

    Published on: August 12, 2013

    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Optical Sensing

    Background:

    • Interferometric setups are crucial for precise measurements.
    • Polarization fading is a common issue in interferometry, limiting sensor performance.
    • Existing systems often require active components or are sensitive to environmental perturbations.

    Purpose of the Study:

    • To introduce a new, robust interferometric setup.
    • To overcome the limitations of polarization fading and component complexity.
    • To enable reliable sensing of time-dependent signals.

    Main Methods:

    • The setup utilizes a 3x3 fiber optic coupler.
    • Two Faraday mirrors are incorporated to eliminate polarization fading.
    • The system is designed to operate with a light-emitting diode (LED) source.

    Main Results:

    • The presented setup is constructed solely from passive optical components.
    • It effectively eliminates the polarization fading problem inherent in many interferometers.
    • The system demonstrates successful operation with an LED, suitable for time-dependent signal detection.

    Conclusions:

    • This passive, polarization-insensitive interferometric setup provides a robust solution for optical sensing.
    • Its design is particularly advantageous for applications requiring the detection of dynamic signals.
    • The system's independence from reciprocal or nonreciprocal constant perturbations enhances its reliability.