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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Related Experiment Video

Updated: Jan 7, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Programmable frequency combs with laser cavity solitons.

Alexis Bougaud, Manal Arbati, Bruno P Chaves

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    Summary
    This summary is machine-generated.

    Researchers numerically studied programmable laser cavity solitons using a nested cavity. This approach enables tunable repetition rates from GHz to THz, offering versatile frequency comb generation.

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    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Photonics

    Background:

    • Nested cavity lasers offer unique properties.
    • Controlling laser repetition rates is crucial for applications.
    • Cavity solitons are stable light structures in nonlinear systems.

    Purpose of the Study:

    • To numerically investigate programmable laser cavity soliton generation.
    • To demonstrate tunable repetition rate control in a nested cavity architecture.
    • To explore the potential for compact and versatile frequency comb generation.

    Main Methods:

    • Numerical simulation of a nested cavity laser.
    • Incorporation of a photonic device as a programmable delay-line.
    • Analysis of temporal interleaving for repetition rate adjustment.

    Main Results:

    • Achieved tunable pulse repetition rates from GHz to THz.
    • Demonstrated the formation of energy-efficient, reconfigurable laser cavity solitons.
    • Validated the use of a programmable delay-line for harmonic mode-locking.

    Conclusions:

    • Programmable delay-lines enable highly tunable passively mode-locked lasers.
    • The proposed nested cavity architecture offers enhanced versatility.
    • Provides practical guidelines for experimental implementation of tunable frequency combs.