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引入激光束的特征辐射与物质的相互作用（诱导的吸收，自发发射，刺激发射）爱因斯坦的A和B系数和B系数和能量密度的表达。 LASER Action and the Conditions for LASER action (Population Inversion and Pumping, meta- stable state ) Requisites of a LASER system(Energy Source or Pumping Mechanism, Active medium and Resonant cavity (or) LASER cavity) Semiconductor LASER or Diode LASER (Principle, construction and working) Applications of LASER (LASER Barcode Reader, LASER打印机，激光冷却）模型问题和数值问题
模块1：激光和光纤（CSE流）
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