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Standing Waves in a Cavity

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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Updated: Jan 5, 2026

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Asymmetrical-cavity picosecond Raman laser at the water-air interface.

Sergey M Pershin, Mikhail Ya Grishin, Vasily N Lednev

|October 16, 2019

Summary

Researchers developed a novel Raman laser at the liquid-air interface, observing a significant 30-fold reduction in stimulated Raman scattering (SRS) threshold near the surface. This finding offers a new method for measuring interaction length in SRS experiments.

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Last Updated: Jan 5, 2026

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

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Published on: July 17, 2016

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

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

Published on: April 4, 2016

Area of Science:

Optics and Photonics
Laser Physics
Surface Science

Background:

Stimulated Raman scattering (SRS) is a crucial nonlinear optical process.
Controlling SRS thresholds is essential for laser development and applications.
Investigating phenomena at liquid-air interfaces presents unique challenges and opportunities.

Purpose of the Study:

To demonstrate a novel Raman laser configuration utilizing an asymmetrical cavity at the liquid-air interface.
To investigate the dependence of the SRS threshold on the position of the pumping laser beam waist relative to the liquid-air interface.
To propose a new lasing mechanism explaining the observed SRS threshold behavior.

Main Methods:

Fabrication of a Raman laser with an asymmetrical cavity positioned at the liquid-air interface.
Systematic variation of the pumping laser beam waist's position across the liquid-air interface.
Observation and quantification of stimulated Raman scattering (SRS) thresholds.
Theoretical modeling to explain the observed anomalous SRS threshold dependence.

Main Results:

Demonstration of a new type of Raman laser operating at the liquid-air interface.
Observation of a significant, paradoxical 30-fold reduction in the SRS threshold near the water-air surface.
Identification of the minimum SRS threshold occurring when the laser beam waist is precisely at the liquid surface.
Validation of threshold measurements at the liquid-air interface as a reliable method for quantifying interaction length in focused beam SRS.

Conclusions:

The liquid-air interface significantly influences SRS thresholds, enabling a substantial reduction.
A novel lasing mechanism is proposed to account for the anomalous SRS threshold behavior observed at the interface.
This study establishes a reliable method for quantitative interaction length measurements in SRS experiments using focused beams at liquid-air interfaces.