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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Tunable rubidium excited state Voigt atomic optical filter.

Longfei Yin, Bin Luo, Junyu Xiong

    Optics Express
    |May 4, 2016
    PubMed
    Summary

    This study presents a tunable rubidium atomic optical filter operating at 1.5 μm, demonstrating a double-peak structure with 57.6% transmittance. Vertical linear polarization proved most efficient for pump laser operation.

    Area of Science:

    • Atomic physics and optical engineering
    • Development of advanced optical filters for telecommunications

    Background:

    • Atomic optical filters are crucial for wavelength selection in optical communication systems.
    • Existing filters, like the Faraday type, have limitations in tunability and efficiency.
    • Rubidium-based filters offer potential for specific wavelength applications.

    Purpose of the Study:

    • To realize a tunable rubidium excited state Voigt atomic optical filter.
    • To operate the filter at the standard optical communication wavelength of 1.5 μm.
    • To investigate the impact of pump polarization on filter performance.

    Main Methods:

    • Fabrication of a Voigt-type atomic optical filter using a rubidium vapor cell.
    • Application of a tunable magnetic field (0-1600 gauss) to control filter characteristics.

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  • Measurement of pump laser absorption and signal laser transmittance under varying polarization conditions.

    • Main Results:

    • Achieved a peak transmittance of 57.6% with a distinct double-peak spectral structure.
    • Each peak exhibited a bandwidth of 600 MHz.
    • Demonstrated a peak transmittance tunability of 1.6 GHz by adjusting the magnetic field.
    • Identified vertical linear polarization as the most efficient for pump laser operation in this Voigt filter configuration.

    Conclusions:

    • The developed rubidium excited state Voigt filter is tunable and operates effectively at 1.5 μm.
    • The filter's performance is significantly influenced by pump polarization, with vertical linear polarization yielding optimal efficiency.
    • This work provides a foundation for more efficient and tunable atomic optical filters in optical communication.