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一个典型的激光器由激光的激活物质所组成,激活物质可以是红宝石晶体(这里的激光激活中心是铬离子)或者是氦氖气体。在棒或管子的两个端面上分别安装着两个反射镜,常用来充分反射轴向传播
A typical laser consists of a laser-activated material, which can be ruby crystals (where laser activation centers are chromium ions) or helium-neon gas. Two mirrors are mounted on each of the two end faces of the rod or tube, commonly used to adequately reflect the axial propagation