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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 10, 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

Whispering-gallery-mode-resonator-based ultranarrow linewidth external-cavity semiconductor laser.

W Liang1, V S Ilchenko, A A Savchenkov

  • 1OEwaves Inc., 2555 E. Colorado Boulevard, Suite 400, Pasadena, California 91107, USA.

Optics Letters
|August 19, 2010
PubMed
Summary

We developed a compact laser using optical feedback for significantly reduced linewidth and enhanced frequency stability. This breakthrough offers a highly stable, pure laser source for advanced applications.

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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

Related Experiment Videos

Last Updated: Jun 10, 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

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

Area of Science:

  • Photonics
  • Laser Physics
  • Materials Science

Background:

  • Achieving ultra-narrow linewidth lasers is crucial for high-precision measurements and communications.
  • Miniaturization of stable laser sources remains a significant engineering challenge.

Purpose of the Study:

  • To demonstrate a miniature self-injection locked distributed-feedback (DFB) laser.
  • To leverage resonant optical feedback from a high-Q crystalline whispering-gallery-mode (WGM) resonator for linewidth reduction.

Main Methods:

  • Utilized a DFB laser architecture.
  • Integrated a high-Q crystalline WGM resonator for optical feedback.
  • Measured laser linewidth and frequency stability using Allan deviation.

Main Results:

  • Achieved a linewidth reduction factor exceeding 10,000.
  • Demonstrated an instantaneous laser linewidth below 200 Hz.
  • Obtained a minimal Allan deviation of 3 x 10(-12) at 20 microseconds integration time.

Conclusions:

  • The developed miniature laser exhibits excellent spectral purity and long-term frequency stability.
  • The self-injection locking technique using WGM resonators is effective for ultra-narrow linewidth laser generation.
  • This compact laser technology holds promise for various precision applications.