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David Notebook: Difference between revisions
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Looks like the first asphere was better over this distance range.
Looking at the fiber with the fiber scope, I saw that it was damaged. This explains some of the weird structures in the beam when looking at it against the wall. I changed to a 810 nm single mode fiber, which seems to work fine for 780. The beam quality if much better, although it still won't collimate very well. I tried a 150mm and 75mm lens again and looked at it against the wall, but the smallest I could focus it to by moving the 75 mm lens was still a couple inches. My best bet at this point might be to go back to a single long focal length lens, but I will make one more try tomorrow. It seems like it should certainly be possible to have the beam collimated well over 1 meter or so like I need.
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