chromatic aberration
Posted: Sun Jan 11, 2015 3:35 pm
I was wondering if someone can help me with a question. Say we have a co-linear beam of 532nm and 633nm. And we want to focus both wavelengths to the same point using a double convex lens. The diameter of each input beam (green and red) can be changed. I was under the impression that the red incoming beam will need to be bigger in relation to the green. This did work (to an extent) with my setup with the spatial filter. And I think this is what the Holowiki says also. I had a look at the Wikipedia entry for "chromatic aberration" and it showed the following diagram:
http://upload.wikimedia.org/wikipedia/e ... am.svg.png
So, if that diagram is kept in mind, if the incoming green (or blue) beam is reduced in diameter, does that mean that its focal point is "pushed forward" towards the red focal point? I have to confess my ignorance of optics and physical science.
http://upload.wikimedia.org/wikipedia/e ... am.svg.png
So, if that diagram is kept in mind, if the incoming green (or blue) beam is reduced in diameter, does that mean that its focal point is "pushed forward" towards the red focal point? I have to confess my ignorance of optics and physical science.