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[Undergraduate Level] ---> Basic Optics & Quantum Mechanics Intro [Graduate Level] ---> Advanced Cavity Design & Gain Calculations [Researchers] ---> Reference Data for Specific Laser Mediums
Amplification alone does not make a laser. Laser light requires a feedback mechanism, typically a pair of mirrors forming an optical cavity or resonator.
The resonator ensures that the light produced is coherent. The cavity also restricts the light to specific frequencies, known as longitudinal modes. 5. Laser Gain and Threshold Condition