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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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Generation of axially modulated plasma waveguides using a spatial light modulator.

G A Hine, A J Goers, L Feder

|July 30, 2016

Summary

Researchers created dynamic plasma waveguides by shaping high-energy laser pulses with a spatial light modulator. This programmable method allows for controlled plasma density profiles, enabling new applications in laser-plasma interactions.

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Area of Science:

Physics
Plasma Physics
Laser Physics

Background:

Plasma waveguides are crucial for guiding high-intensity laser pulses over long distances.
Existing methods for generating plasma waveguides often lack precise control over their structure.

Purpose of the Study:

To demonstrate a novel method for generating axially modulated plasma waveguides.
To enable dynamic and programmable control over plasma waveguide properties.

Main Methods:

Utilizing a spatial light modulator (SLM) to impart transverse phase modulations onto a low-energy laser pulse.
Interferometrically combining the modulated low-energy pulse with a high-energy laser pulse to sculpt the intensity profile.
Focusing the patterned high-energy pulse with an axicon lens to form the plasma density profile.

Main Results:

Successfully generated centimeter-scale, axially modulated plasma waveguides.
Demonstrated dynamic and programmable shaping of both the laser intensity profile and the resulting plasma density profile.
Achieved control over the shape and periodicity of the plasma waveguides.

Conclusions:

The SLM-based laser pulse shaping technique offers a versatile and programmable approach to creating tailored plasma waveguides.
This method provides unprecedented control over plasma waveguide structures, opening avenues for advanced laser-plasma experiments.