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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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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Backscattering-Induced Dissipative Solitons in Ring Quantum Cascade Lasers.

Lukas Seitner¹, Johannes Popp¹, Ina Heckelmann²

¹TUM School of Computation, Information and Technology, Technical University of Munich (TUM), 85748 Garching, Germany.

Physical Review Letters

|February 9, 2024

Summary

Ring quantum cascade lasers offer ultrastable frequency combs for integrated spectrometers. A small coupling between counterpropagating waves is crucial for stabilizing soliton operation, matching experimental results.

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Area of Science:

Quantum optics
Semiconductor lasers

Background:

Ring quantum cascade lasers (QCLs) are gaining attention for frequency comb generation.
Their potential for integrated spectrometers in mid-infrared and terahertz regions is significant.

Purpose of the Study:

To investigate the mechanism behind stable soliton operation in ring quantum cascade lasers.
To validate theoretical models against experimental data.

Main Methods:

Utilized a self-consistent Maxwell-Bloch model.
Compared model predictions with experimental observations.

Main Results:

Demonstrated that distributed backscattering induces coupling between counterpropagating waves.
Showed this coupling is essential for stabilizing the soliton solution.
Achieved excellent agreement between the model and experimental data.

Conclusions:

Distributed backscattering and resulting wave coupling are key to stable soliton formation in ring QCLs.
This finding advances the development of integrated spectrometers based on QCL technology.