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IR Spectrometers01:25

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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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All-mirror wavefront division interferometer for Fourier transform spectrometry across multiple spectral ranges.

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    This study introduces a novel all-mirror interferometer for broad spectral range spectroscopy. The design offers an alternative to Fourier transform spectrometers, enabling dispersion measurements with off-the-shelf components.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Interferometry

    Background:

    • Standard Fourier transform spectrometers have limitations in certain laser-based applications.
    • Developing versatile spectroscopic tools for wide spectral ranges is crucial for material science and chemical analysis.

    Purpose of the Study:

    • To design and demonstrate an all-mirror wavefront-division interferometer for multi-spectral range spectroscopic studies.
    • To present a theoretical framework and validate it with simulations and experiments.
    • To showcase its capability for measuring sample dispersion.

    Main Methods:

    • Utilized an all-mirror wavefront-division interferometer design.
    • Developed a theoretical framework with an analytical solution for far-field interference patterns.
    • Employed cost-effective off-the-shelf components, including knife-edge prisms.
    • Validated the design through optical propagation simulations and experimental results.
    • Coupled the system with an octave-spanning supercontinuum source (1.5 µm - 4.4 µm).

    Main Results:

    • Demonstrated an ultra-broad optical bandwidth, high throughput, and dispersion-free operation.
    • Achieved variable arm split ratio and a simple architecture.
    • Successfully performed transmission spectroscopy on polymers (polypropylene) and gas (methane).
    • Successfully performed reflectance spectroscopy on pharmaceuticals (insulin products).

    Conclusions:

    • The developed interferometer is a viable and prospective alternative to standard Fourier transform spectrometers for laser-based applications.
    • The system's design inherently allows for the measurement of sample dispersion.
    • The practical implementation with affordable components proves its feasibility for diverse spectroscopic studies.