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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:
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...

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Related Experiment Video

Updated: Jun 22, 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

External cavity multiwavelength semiconductor mode-locked lasers gain dynamics.

Luis C Archundia-Berra, Peter J Delfyett

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    External cavity lasers with inherent pulse chirp enable stable multiwavelength operation by slowing gain depletion in semiconductor optical amplifiers (SOAs). This research details the gain dynamics crucial for advanced optical communications.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Devices
    • Laser Physics

    Background:

    • Semiconductor optical amplifiers (SOAs) are key components in optical communication systems.
    • External cavity semiconductor mode-locked lasers can generate multiwavelength pulses but face challenges with gain competition.
    • Understanding gain dynamics is crucial for optimizing laser performance.

    Purpose of the Study:

    • To investigate the gain dynamics of SOAs when amplifying pulses from external cavity semiconductor mode-locked lasers.
    • To analyze the intracavity gain dynamics of these lasers under multiwavelength operation.
    • To elucidate the mechanisms enabling stable multiwavelength operation.

    Main Methods:

    • Pump-probe techniques were employed to measure SOA gain dynamics.
    • Amplification of various pulse durations (750 fs, 6.5 ps) and multiwavelength pulses was studied.
    • Intracavity gain dynamics were measured during multiwavelength operation.
    • Numerical simulations were performed to support experimental findings.

    Main Results:

    • Inherent pulse chirp from external cavity lasers leads to slow gain depletion in SOAs.
    • Fast gain dynamics were found to be insignificant.
    • Slow gain depletion mitigates gain competition between wavelength channels.
    • Nonlinearities in the SOA gain media were reduced, facilitating multiwavelength operation.

    Conclusions:

    • The chirp-induced slow gain depletion is the primary factor enabling stable multiwavelength operation of external cavity semiconductor mode-locked lasers.
    • SOAs can effectively amplify multiwavelength pulses without significant gain competition when driven by chirped pulses.
    • These findings provide insights for designing advanced laser sources for optical networking.