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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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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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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Writing Bragg Gratings in Multicore Fibers
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Broadband multimode fiber spectrometer.

Seng Fatt Liew, Brandon Redding, Michael A Choma

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    This study introduces an all-fiber spectrometer overcoming resolution-bandwidth trade-offs. It achieves 100 nm bandwidth with 0.03 nm resolution using a novel algorithm for spectral reconstruction.

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    Area of Science:

    • Photonics and Spectrometry
    • Optical Engineering

    Background:

    • Traditional spectrometers face limitations in balancing spectral resolution and bandwidth.
    • Achieving high resolution over a wide spectral range often requires complex and bulky instrumentation.

    Purpose of the Study:

    • To demonstrate a general-purpose all-fiber spectrometer that overcomes the resolution-bandwidth trade-off.
    • To develop an efficient spectral reconstruction algorithm for multimode fiber-based systems.

    Main Methods:

    • Integration of a wavelength division multiplexer with five multimode optical fibers.
    • Development of an efficient algorithm to reconstruct spectra from speckle patterns generated by guided mode interference.
    • Utilizing speckle patterns produced by interference of guided modes in multimode fibers for spectral analysis.

    Main Results:

    • Achieved a 100 nm bandwidth with 0.03 nm spectral resolution at a 1500 nm wavelength.
    • Demonstrated rapid and accurate spectral reconstruction for both sparse and dense spectra.
    • Successfully reconstructed spectra in the presence of noise.

    Conclusions:

    • The developed all-fiber spectrometer effectively addresses the spectral resolution and bandwidth limitations.
    • The efficient reconstruction algorithm enables high-performance spectral analysis in a compact fiber-based system.
    • This technology holds promise for various applications requiring precise spectral measurements.