透镜的NA问题

无聊瓜子 · *发表于* 2007-5-30 20:45:30

“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.”

我要设计球面透镜来耦合二极管，然后泵浦激光晶体。

我需要焦深长一点，就需要“lower NA"的透镜。但是，同时我又需要焦点小一点，我就需要”High NA"的透镜。要同时满足这两个要求，我该如何折中呢？NA在0.5左右，好不好呢？

请高手不吝赐教。