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Related Concept Videos

Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

538
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
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Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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Laser power stabilization via radiation pressure.

Marina Trad Nery, Jasper R Venneberg, Nancy Aggarwal

    Optics Letters
    |April 15, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a new active laser power stabilization method using radiation pressure on a movable mirror. This technique offers sensitive, non-destructive measurement for improved laser power control.

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    Area of Science:

    • Optics and Photonics
    • Quantum Measurement
    • Experimental Physics

    Background:

    • Active laser power stabilization is crucial for precision measurements.
    • Conventional methods often involve destructive detection, limiting sensitivity.
    • Radiation pressure effects offer a potential avenue for non-destructive sensing.

    Purpose of the Study:

    • To experimentally demonstrate a novel active power stabilization scheme.
    • To utilize radiation pressure-induced mirror motion for sensing laser power fluctuations.
    • To assess the sensitivity and frequency range of the proposed stabilization technique.

    Main Methods:

    • Sensing laser power fluctuations via radiation pressure on a movable mirror.
    • Employing a weak auxiliary laser beam and a Michelson interferometer to measure mirror displacement.
    • Implementing a feedback control system based on the interferometer's in-loop sensor.
    • Conducting a proof-of-concept experiment for power stabilization.

    Main Results:

    • Successful experimental realization of the active power stabilization scheme.
    • Demonstration of power stabilization in the frequency range from 1 Hz to 10 kHz.
    • Validation of the non-demolition measurement technique for enhanced sensitivity.
    • Identification of thermal noise as the low-frequency limitation at room temperature.

    Conclusions:

    • The novel radiation pressure-based active power stabilization scheme is experimentally validated.
    • This non-demolition sensing approach offers superior sensitivity for laser power fluctuation detection.
    • The technique shows promise for applications requiring highly stable laser power, with future improvements possible by mitigating thermal noise.