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Mode-medium instability and its correction with a Gaussian-reflectivity mirror.

K L Webster, C C Sung

|August 19, 2010

Summary

This summary is machine-generated.

High-power carbon dioxide (CO2) laser beams degrade due to mode-medium instability (MMI). Using a Gaussian-reflectivity mirror effectively mitigates MMI effects, improving beam quality.

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Area of Science:

Optics and Photonics
Laser Physics
Computational Physics

Background:

High-power carbon dioxide (CO2) lasers are susceptible to mode-medium instability (MMI) after short durations.
MMI arises from intensity-dependent heating linked to the vibrational-to-translational decay of CO2 lasing levels.

Purpose of the Study:

To model the temporal evolution of CO2 laser beams affected by MMI.
To investigate MMI in unstable resonators with hard-edge output mirrors.
To evaluate the efficacy of a Gaussian-reflectivity mirror in mitigating MMI.

Main Methods:

Developed an iterative numerical technique to simulate beam time evolution under MMI.
Analyzed MMI in unstable CO2 resonators with varying Fresnel numbers and gas densities.
Employed a Gaussian-reflectivity mirror to counteract MMI.

Main Results:

Hard-edge unstable resonators exhibit mode deterioration due to diffraction ripples.
The Gaussian-reflectivity mirror significantly smoothed the intensity profile.
MMI effects were substantially reduced by the Gaussian-reflectivity mirror.

Conclusions:

Diffraction ripples in hard-edge unstable resonators contribute to mode deterioration.
Gaussian-reflectivity mirrors offer an effective solution for mitigating MMI in CO2 lasers.
The study presents quantitative data on peak density variation and beam quality improvements.