Hi all, I'm mostly trying to pick the right fiber collimation/ coupler to get a laser beam (or other source maybe) into a fiber. Fiber is multi mode 63 um diameter core, NA= 0.27. The laser source is ~800nm. I was looking at these
on thorlabs https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=944&pn=F220FC-780 (You'll have to scroll down.)
Do I want to pick a coupler with a lens that matches the NA of the fiber to get the most light into the fiber?
Does the beam diameter tell me the maximum beam size that will make it into the fiber?
(Sorry for the rather simple questions.)
George H.
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