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Unfortunately the order placed for beam samplers last week did not go through. These will be used at the X and Y end tables to dump the unwanted light appropriately. Since they will not be here until Tuesday, I revised the timeline for FOL related activities accordingly.
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I was working on the PSL table today.
Since the rejected 1064nm light after the SHG crystal is not easily reachable to measure beam widths close to the waist, I put a lens f=300mm and measured the beam size around its focus. I used this data and redesigned the telescope using 'a la mode'.
I used a beam splitter to attenuate the beam directed towards the fiber. The reflected beam from BS has been dumped (I need to find a better beam dump than what is being used right now.
I have only ~200uW at the input of the fiber coupler after the BS and 86uW at the output of the fiber (43% coupling).
I moved the GTRY DC photodiode and the lens in front of it to make space for the fiber coupler mount.
The layout on the PSL table right now is as shown below.
I have also put the fiber chassis inside the PSL enclosure on the rack. I moved the coherent spectrum analyser controller that is not being used to make space on the rack.
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