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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 22, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Cavity-enhanced laser absorption spectroscopy using microresonator whispering-gallery modes.

G Farca, S I Shopova, A T Rosenberger

    Optics Express
    |June 25, 2009
    PubMed
    Summary

    This study demonstrates tunable diode laser absorption spectroscopy using microresonator whispering-gallery modes (WGMs). This technique achieves centimeter effective absorption pathlengths in a tiny volume, ideal for trace gas detection.

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    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

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    Last Updated: Jun 22, 2026

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
    12:18

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

    Published on: August 5, 2013

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
    12:21

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

    Area of Science:

    • Spectroscopy
    • Optical Physics
    • Cavity Enhanced Detection

    Background:

    • Whispering-gallery modes (WGMs) in microresonators offer high Q-factors for sensitive measurements.
    • Integrating WGMs with tunable diode lasers enables precise spectroscopic analysis.

    Purpose of the Study:

    • To demonstrate tunable diode laser absorption spectroscopy (TDLAS) utilizing microresonator WGMs.
    • To achieve high-sensitivity gas detection in a compact system.

    Main Methods:

    • Excitation of WGMs in a cylindrical microresonator (125 µm diameter) using an adiabatically tapered fiber.
    • Tuning the microresonator by stretching to lock individual WGMs to the laser frequency.
    • Recording changes in fiber throughput as the laser scans across a trace-gas absorption line.

    Main Results:

    • Achieved centimeter effective absorption pathlengths.
    • Demonstrated cavity-enhanced detection in a volume of a few hundred microns cubed.
    • Experimental results showed good agreement with theoretical predictions.

    Conclusions:

    • Microresonator-based TDLAS is a viable technique for sensitive trace-gas detection.
    • The compact system offers significant advantages in terms of size and sensitivity.
    • This method paves the way for miniaturized, high-performance spectroscopic sensors.