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Related Concept Videos

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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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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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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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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Mid-infrared homodyne balanced detector for quantum light characterization.

Tecla Gabbrielli, Francesco Cappelli, Natalia Bruno

    Optics Express
    |May 14, 2021
    PubMed
    Summary

    We developed a new mid-infrared balanced homodyne detector. Our detector achieves shot-noise-limited performance, crucial for detecting non-classical light in quantum technologies.

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    Area of Science:

    • Quantum optics
    • Infrared spectroscopy
    • Detector physics

    Background:

    • Detecting non-classical mid-infrared light is challenging.
    • Quantum cascade lasers emit in the mid-infrared.
    • High-performance detectors are needed for quantum applications.

    Purpose of the Study:

    • To characterize a novel balanced homodyne detector for mid-infrared applications.
    • To assess the detector's performance for quantum technology.

    Main Methods:

    • Balanced homodyne detection in the mid-infrared.
    • Intensity noise power spectral density analysis.
    • Characterization of differential signal from incident radiation.

    Main Results:

    • The detector operates in the mid-infrared spectrum.
    • The setup achieves shot-noise-limited performance.
    • Demonstrated suitability for detecting non-classical light.

    Conclusions:

    • The novel detector is a high-performance system for mid-infrared quantum optics.
    • Potential applications include free-space quantum communication.
    • Enables advancements in mid-infrared quantum technologies.