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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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Related Experiment Video

Updated: Jun 19, 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

Mode hopping in external-cavity diode lasers.

S Sivaprakasam, R Saha, P A Lakshmi

    Optics Letters
    |October 30, 2009
    PubMed
    Summary
    This summary is machine-generated.

    External-cavity diode lasers exhibit mode hopping, influenced by feedback and phase. Increased feedback causes deviations from standard potential well models, requiring new qualitative explanations for laser behavior.

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    Published on: May 30, 2014

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Nonlinear Dynamics

    Background:

    • External-cavity diode lasers (ECDLs) are crucial for tunable laser applications.
    • Mode hopping, a phenomenon in lasers where the output frequency abruptly shifts, affects laser stability and performance.
    • Existing theoretical models, such as potential well models, attempt to explain mode hopping dynamics.

    Purpose of the Study:

    • To experimentally investigate mode hopping in AlGaAs diode lasers with external cavities.
    • To analyze the dependence of mode hopping on feedback levels and external cavity round-trip phase.
    • To compare experimental findings with predictions from potential well models and explore discrepancies.

    Main Methods:

    • Experimental setup involving AlGaAs diode lasers coupled to an external cavity.
    • Systematic variation of optical feedback power into the diode laser.
    • Controlled adjustment of the external cavity's round-trip phase.
    • Comparison of observed mode hopping behavior with theoretical predictions.

    Main Results:

    • Mode hopping was experimentally observed and characterized in the AlGaAs ECDLs.
    • The phenomenon shows a clear dependence on both the amount of optical feedback and the cavity phase.
    • Significant deviations from potential well model predictions were observed as feedback levels increased.
    • A qualitative treatment was developed to address the observed discrepancies.

    Conclusions:

    • The study provides experimental evidence of mode hopping in AlGaAs ECDLs.
    • Potential well models are insufficient to fully describe mode hopping under higher feedback conditions.
    • Further theoretical development, including qualitative approaches, is needed for accurate modeling of laser dynamics with significant feedback.