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Related Concept Videos

Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Updated: Jun 16, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Unstable optical resonators.

A E Siegman

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Unstable optical resonators are ideal for lasers with moderate gain and high Fresnel numbers. They offer high-quality, near-diffraction-limited beams and efficient energy extraction.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Optical resonators are crucial components in laser systems.
    • Understanding resonator properties is key to optimizing laser performance.

    Purpose of the Study:

    • To review theoretical and experimental findings on unstable optical resonators.
    • To identify optimal resonator designs for specific laser parameters.

    Main Methods:

    • Literature review of theoretical models.
    • Analysis of experimental data on resonator properties.

    Main Results:

    • Unstable resonators are well-understood theoretically and experimentally confirmed.
    • They excel in lasers with moderate gain and Fresnel numbers > 1.

    Conclusions:

    • Unstable resonators provide the best practical design for high-quality laser beams.
    • They enable efficient energy extraction from the laser medium.