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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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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Integrated optical Young interferometer.

A Brandenburg, R Henninger

    Applied Optics
    |October 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact integrated optical Young interferometer for precise refractometry and chemical sensing. The device uses a low-coherence laser and electronic scanning for rapid, accurate measurements of liquid and gas refractive indices.

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    Area of Science:

    • Optoelectronics
    • Chemical Sensing
    • Optical Metrology

    Background:

    • Integrated optical devices offer miniaturization and enhanced performance for sensing applications.
    • Young interferometers are sensitive to optical path length changes, useful for refractive index measurements.
    • Refractometry and chemical sensing require precise measurement of refractive indices of various media.

    Purpose of the Study:

    • To propose and demonstrate an integrated optical Young interferometer for refractometry and chemical sensing.
    • To address the ambiguity in interference order for accurate refractive index determination.
    • To develop a compact and fast sensing system without moving parts.

    Main Methods:

    • Coupling laser diode light into an integrated optical Y-branch.
    • Operating the laser diode below threshold to achieve low coherence length and visibility modulation.
    • Employing an electronic scanning technique with a CCD array for fringe analysis.

    Main Results:

    • A compact integrated optical Young interferometer was successfully fabricated and tested.
    • The device accurately measures the refractive index of liquids and gases.
    • The low-coherence operation effectively resolved interference order ambiguity.
    • Electronic scanning enabled fast data acquisition without mechanical components.

    Conclusions:

    • The proposed integrated optical Young interferometer is a viable platform for compact and efficient refractometry and chemical sensing.
    • The technique of operating a laser diode below threshold is effective for resolving interference order ambiguity in low-coherence interferometry.
    • The electronic scanning method provides a fast and robust readout mechanism for integrated optical sensors.