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I have a laser where I can adjust the focal length, however it has a large spot size. I am trying to shrink that down significantly with a microscope objective, how can I go about doing that?

Should I put the laser out of focus, capture the light through the objective, then ensure the objective is at the right height and not out of focus?

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  • $\begingroup$ Do you have an objective in mind? Is it infinity corrected or on old school RMS thread type? $\endgroup$ – D Duck Aug 5 '19 at 20:23

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