Friday, September 21, 2012
Bounce back angle from the slit wheel mirror
Now that there is an Al flat mirror in one of the slit wheel positions, we wanted to see at what angle it returns the beam. These photos show the laser bumper where the tip of the red laser fiber lies. A card held over the input beam clearly shows the input beam shining through. What the second photo is *supposed* to show is that the beam returned from the mirror can only be clearly seen by partially obstructing the input beam (there is a bright dot in the middle of the glow from the input beam -- hard to see in this image.) So basically, the mirror returns the beam almost to the point of the laser fiber tip.
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2 comments:
How did the sizes compare? Did it look like we were coming back to focus? Don't think we'd make any adjustments if we aren't exactly at focus, but I'm curious.
It was near a focus, and the return spot size was smaller-- but I'm comparing that to the input beam at a point where it hadn't crossed the cold stop yet. I'm not sure where else the return beam could be picked off successfully.
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