[Erin, Daniel, Torrey]

We first profiled the 775nm light coming from the fiber that we ran from the larger table. We found that it was a bit smaller than a waist than we were looking for (we want a 3mm beam waist to image as much of the mirror as possible), and decided to use a pair of lenses to diverge the beam and then to collimate it. We used JamMT to find a solution for this, which suggested a 35mm and a 250mm set of lenses. We aligned those and tried to re-profile the light, but we were finding that the radius of the beam was too large to use the beam profiler, and some was getting cut off. We switched to using the Basler Ace 775mm camera with an ND filter to cut down on some of the light and get a better image, and took 5 measurements, varying the camera at different lengths so we could tell if the light is collimated. 

Next step is to first make sure the beam is actually collimated (using beam profiling code Ian sent and the images we took with the CCD camera). We also noticed that the beam is not all the same polarization, which means the PBS will not separate the light equally. So on Monday we will also have to find a way to polarize the light so it is all the same. 

The pictures are the current setup on the table, and the updated setup made in Inkscape (we adjusted the original design so it fit in the space we have on the table, and so we have easy access to the end mirror mount).  

(Did all this Friday, but I forgot to post)