[Yuhang, Eleonora]

We made a tentative design of the position and dimensions of the breadboard we plan to use for the AA quadrants.

It is shown in the first attached scheme.

The dimension we selected is 300x450 mm (https://www.thorlabs.com/thorproduct.cfm?partnumber=MB3045/M)

According to this design, the reflected beam collected by the Farady isolator is sent to the board by a steering mirror and reach the board after a path of 637mm.  (See second attached scheme.)  It might be possible to install a lens on this path.

The dimension and position (above the AUX lasers)  have been chosen to allow the access to all the optics. If a larger breadbord is needed we can cosider to extend it above the "PLL area".

Some pictures of the bench are also attached. Here we used a plastic sheet of the same sized of the board to better visualize the occupied space. Fixing the breadbord posts will require some adjustment of the cables but seems feasable.