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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

617
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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IR Spectrometers01:25

IR Spectrometers

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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

UV–Vis Spectrometers

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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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Related Experiment Video

Updated: Nov 5, 2025

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Miniaturized integrated spectrometer using a silicon ring-grating design.

Naif Alshamrani, Andrew Grieco, Brandon Hong

    Optics Express
    |May 14, 2021
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    Summary
    This summary is machine-generated.

    We developed a compact silicon spectrometer for the short-wavelength infrared (SWIR) spectrum. It uses a ring resonator and distributed Bragg reflector filter for high resolution across a broad bandwidth.

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    Area of Science:

    • Photonics
    • Spectroscopy
    • Integrated optics

    Background:

    • Miniaturized spectrometers are crucial for various applications.
    • Existing silicon photonic spectrometers face limitations in bandwidth and resolution.

    Purpose of the Study:

    • To introduce and demonstrate a novel miniaturized integrated spectrometer.
    • To achieve broad bandwidth operation in the short-wavelength infrared (SWIR) spectrum with high spectral resolution.

    Main Methods:

    • Integration of an add-drop ring resonator narrowband filter with a distributed Bragg reflector (DBR) broadband filter on a silicon photonic platform.
    • Utilizing contra-directional coupling DBR filters and ring resonators for spectral filtering.
    • Employing thermo-optic effect for simultaneous tuning of filter components.
    • Cascading multiple spectrometer cells for extended spectral coverage.

    Main Results:

    • Demonstrated a spectrometer with a broadband filter (3.9 nm) and a narrowband filter (0.121 nm).
    • Overcame the free spectral range limitation of ring resonators using DBR filters.
    • Achieved simultaneous tuning of both filter components via the thermo-optic effect.
    • Configured cascaded cells for high spectral resolution over a large bandwidth with high extinction ratio (ER).

    Conclusions:

    • The developed silicon photonic spectrometer offers a miniaturized, high-performance solution for SWIR spectral analysis.
    • The cascaded cell design enables broad spectral coverage and high resolution, suitable for diverse applications.
    • This integrated approach simplifies spectrometer design and enhances performance characteristics.