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Related Concept Videos

Faraday's Law01:10

Faraday's Law

5.6K
Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the...
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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Lenz's Law01:15

Lenz's Law

6.0K
The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
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Capacitors01:15

Capacitors

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
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Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Filtration00:53

Filtration

4.7K
Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Related Experiment Video

Updated: Jan 7, 2026

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
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Lithium Faraday filter: some like it hot.

Maximilian Luka, Yijun Wang, Denis Uhland

    Optics Letters
    |December 24, 2025
    PubMed
    Summary

    This study demonstrates a narrowband lithium vapor Faraday filter for precise optical frequency control. The filter achieves 82% peak transmittance, enabling advanced applications in spectroscopy and optical communications.

    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Quantum Optics
    • Spectroscopy

    Background:

    • Narrowband optical filters are crucial for precise frequency selection in various applications.
    • Faraday filters utilize magneto-optic effects to achieve narrow spectral bandwidths.
    • Lithium vapor presents unique atomic transitions suitable for filter development.

    Purpose of the Study:

    • To experimentally and theoretically investigate a narrowband lithium vapor Faraday filter.
    • To optimize filter parameters for maximum transmittance at 671 nm.
    • To develop a theoretical model capable of handling overlapping lithium transitions.

    Main Methods:

    • Experimental setup using a lithium heat pipe oven and a longitudinal magnetic field.
    • Theoretical modeling incorporating Doppler broadening and atomic resonance.

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  • Extension of the ElecSus Python library to calculate lithium atomic susceptibilities.

    • Main Results:

    • Demonstrated a lithium Faraday filter with a 2.2 GHz bandwidth at 671 nm.
    • Achieved a peak transmittance of 82% for the optimized filter.
    • Developed a theoretical model that accounts for simultaneous D1 and D2 transitions in lithium.

    Conclusions:

    • The lithium vapor Faraday filter is a viable technology for narrowband optical frequency transmission.
    • The extended ElecSus library provides a robust tool for modeling complex atomic systems.
    • This work advances the development of high-performance optical filters for scientific and technological applications.