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Light Amplification by Stimulated Emission of Radiation. A means of creating coherent light by either driving an atomic or molecular transition in an optical cavity or firing a beam of electrons through an undulator.

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What is the relationship between tube size and power output for a $\rm CO_2$ Laser?

Important Carbon dioxide laser characteristics are high unsaturated gain, high-power output and good efficiency. … These tubes can be used as amplifiers as well as oscillators by simply directing a laser beam down the length of the tube. …
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