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Related Concept Videos

The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...

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Related Experiment Video

Updated: Jun 23, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Free-electron laser exploiting a superlattice-like medium.

V V Apollonov, A Artemyev, M Fedorov

    Optics Express
    |April 23, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study explores amplification in free-electron lasers (FELs) using periodically modulated media. The large-modulation regime significantly broadens the operational frequency domain for low-energy electron beams.

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    Last Updated: Jun 23, 2026

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    Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
    11:21

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    Published on: March 30, 2017

    Area of Science:

    • Physics
    • Quantum Optics
    • Laser Physics

    Background:

    • Free-electron lasers (FELs) are crucial for generating tunable, high-intensity radiation.
    • Periodically modulated media offer novel approaches to enhance FEL performance.
    • Understanding amplification regimes is key to optimizing FEL design.

    Purpose of the Study:

    • To investigate amplification in free-electron lasers (FELs) under large modulation of refractive indices.
    • To establish conditions for the large-modulation regime in superlattice-like media.
    • To determine optimal parameters for maximized gain and efficiency.

    Main Methods:

    • Theoretical analysis of amplification in FELs with large refractive index modulation.
    • Establishment of conditions for the large-modulation regime in superlattice structures.
    • Determination of maximized gain, saturation field, efficiency, electron energy, and propagation direction.

    Main Results:

    • Maximized gain, saturation field, and efficiency are determined for the large-modulation regime.
    • Optimal electron energy and propagation direction are identified.
    • The large-modulation regime significantly extends the operational frequency domain for low-relativistic electron beams.

    Conclusions:

    • The large-modulation regime in FELs offers a significant expansion of operational frequencies.
    • This regime is particularly beneficial for FELs utilizing low-relativistic electron beams.
    • The findings provide insights into FELs related to Cherenkov and stimulated resonance-transition radiation.