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Related Concept Videos

Faraday's Law01:10

Faraday's Law

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 direction in...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Joule-Thomson Effect01:21

Joule-Thomson Effect

The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Published on: December 5, 2025

In-vacuum optical isolation changes by heating in a Faraday isolator.

, Fausto Acernese, Mohamed Alshourbagy

    Applied Optics
    |January 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Optical isolation in Faraday isolators significantly decreases in vacuum due to thermal effects. This study models and experimentally verifies a tenfold isolation drop in a gravitational wave experiment, confirming crystal absorption losses.

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    Area of Science:

    • Optics
    • Materials Science
    • Experimental Physics

    Background:

    • Faraday isolators are crucial for laser stability, especially in sensitive experiments like gravitational wave detection.
    • Changes in optical isolation can occur when environmental conditions shift, such as transitioning from air to vacuum.
    • Thermal effects within the magneto-optic crystal can impact isolator performance.

    Purpose of the Study:

    • To model and evaluate the changes in optical isolation of a Faraday isolator when transitioning from air to vacuum.
    • To investigate the role of thermal effects, including crystal thermal lensing and Verdet constant variations, in this performance change.
    • To experimentally validate the model using data from a gravitational wave experiment and a test bench.

    Main Methods:

    • Development of a model to assess optical isolation changes due to thermal effects in a Faraday isolator.
    • Experimental observation of isolation decrease in a Faraday isolator used in the Virgo gravitational wave experiment.
    • Finite element model simulation to reproduce experimental data and characterize crystal properties.

    Main Results:

    • A significant decrease in optical isolation (by a factor of 10) was observed when a Faraday isolator moved from air to vacuum.
    • The study identified crystal thermal lensing (refraction index and thermal expansion) and Verdet constant changes as key factors.
    • Finite element model simulations accurately reproduced experimental data, confirming the model's validity.
    • Absorption losses of 0.0016 +/- 0.0002/cm for the TGG crystal were determined.

    Conclusions:

    • The transition from air to vacuum significantly impacts Faraday isolator performance due to reduced convective cooling and resulting thermal effects.
    • The developed finite element model accurately predicts these performance changes and can be used to characterize crystal properties.
    • Understanding and mitigating these thermal effects is crucial for maintaining high optical isolation in demanding applications like gravitational wave interferometers.