标题: 透镜的NA问题 [打印本页] 作者: 无聊瓜子 时间: 2007-5-30 20:45 标题: 透镜的NA问题 “Lower NAs are best when a large depth of focus is important or when you need nearly circular beams.
High numerical aperture lenses are important when you need to focus light down to a small spot size or when you need the maximum light capture from a diode laser.”