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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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Speckle-displacement-based wavemeter for mode-hop and side-mode detection.

Muhammad T Jamal, Michael L Jakobsen, Steen G Hanson

    Applied Optics
    |February 24, 2022
    PubMed
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    This study introduces a novel speckle-displacement wavemeter for distributed Bragg reflector (DBR) tapered lasers. This device accurately measures wavelength shifts, mode hops, and side-mode suppression ratios (SMSRs) for stable laser output.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Metrology

    Background:

    • Distributed Bragg reflector (DBR) tapered lasers can suffer from multimode operation, affecting output directionality.
    • Accurate characterization of laser wavelength, mode hops, and side-mode suppression ratio (SMSR) is crucial for various applications.

    Purpose of the Study:

    • To develop and validate a speckle-displacement-based wavemeter combined with a spatial filter.
    • To eliminate the influence of multimode operation on laser output directionality.
    • To demonstrate the measurement of mode hops and SMSRs.

    Main Methods:

    • A speckle-displacement wavemeter was integrated with a spatial-fundamental-mode-pass filter.
    • The setup utilizes laser illumination of a rough surface and observation of back-scattered speckle patterns.
    • Speckle pattern shifts, tracked via covariance function peaks, correlate with wavelength changes.

    Main Results:

    • The wavemeter achieved a spectral resolution of 10.4 MHz.
    • Mode hops did not cause significant speckle pattern decorrelation.
    • The side-mode suppression ratio (SMSR) was found to correlate with the covariance function's peak height and width.

    Conclusions:

    • The developed wavemeter effectively measures wavelength, mode hops, and SMSRs.
    • This technique is valuable for applications requiring stable single-frequency laser light, such as spectroscopy and quantum optics.
    • The system offers a robust method for characterizing diode lasers.