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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: Mar 20, 2026

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Published on: July 29, 2013

Fiber-Type Random Laser Based on a Cylindrical Waveguide with a Disordered Cladding Layer.

Wei Li Zhang¹, Meng Ya Zheng¹, Rui Ma¹

¹Key Laboratory of Optical Fiber Sensing &Communications (Education Ministry of China), University of Electronic Science &Technology of China, Chengdu, 611731, China.

Scientific Reports

|May 26, 2016

Summary

This summary is machine-generated.

Researchers developed a novel fiber-type random laser using a disordered capillary coated with a gain solution. This flexible random laser (RL) shows sensitivity to dye concentration, enabling potential sensing applications.

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Area of Science:

Photonics and Optics
Materials Science

Background:

Random lasers (RLs) offer unique light generation properties.
Existing RL fabrication methods can be complex and lack flexibility.

Purpose of the Study:

To report a novel fiber-type random laser (RL) structure.
To investigate the performance and potential applications of this new RL.

Main Methods:

Fabrication of a capillary with an internally disordered coating.
Filling the capillary core with a laser dye solution.
Characterization of the random lasing properties.

Main Results:

The fiber-type RL successfully formed random lasing modes.
Lasing intensity exhibited a clear exponential relationship with dye concentration.
The RL demonstrated sensitivity to changes in gain medium concentration.

Conclusions:

The proposed fiber-type structure provides a flexible and efficient platform for random laser fabrication.
The sensitivity of the RL to dye concentration opens possibilities for random lasing-based sensing applications.