Image of laser fiber off foreoptics ellipsoid
The FWHM on this (optimistic) cut is about 4 pixels (22µm) which is on the right order for a diffraction-limited image. Worst case (cutting along the diagonal structure) it's about a factor of two larger.
Most of the improvement here comes from adding enough ND filters to avoid saturation on the camera, and then tweaking the with better accuracy because we could actually see the image.
Here the optics are installed as close as I can manage to the design geometry, with Dana's clocking shims still installed. I'll measure and tweak a bit more tomorrow, and while there is still a lot of tweaking we could do, it's probably an academic exercise at this point. I'm thinking of installing the hyperboloid tomorrow and finding out what the resulting spot looks like. We can always come back to the ellipsoid alone if we need to.
1 comment:
Wow! That looks much better. Nice to see a sharp profile.
You left out a word in the explanation: "... and then tweaking the ___ with better...." What goes up into the blank?
Can you give me an idea of how much clocking you had to do with the shims?
At this point, I think installing the hyperboloid is the right way to go.
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