短语词组短语beam waist spot size 束腰光斑尺寸Beam -spot receiver 光斑接收器beam -spot 束斑laser beam flying spot scanner 激光束飞点扫描器beam spot size 束斑大小threshold beam spot 阈值光斑的Beam Spot Shape 光斑形状beam spot broadening 束斑展宽ion beam spot 离子束斑 返回 beam spot