Can you please give us some more details on how this design was decided upon? What were the design considerations?
It would be nice to have a shorter path length for WFS2. What is the desired spot size on the WFS? How sensitive are they going to be to IMC input alignment? Are we still going to be recentering the WFS all the time?
I did the calculation, and I reduced the beam Path. In my calculation, I restricted the waist size at the WFSs to be between 1mm-2mm also the other parameter is that the Gouy Phase different between the WFSs have to be 90 degrees. I also try to minimize the amount of mirrors used. I found the Gouy phase to be 89.0622 degrees between the WFSs and the following table shows the solution that I got from a la mode:
label z (m) type parameters
----- ----- ---- ----------
MC1 0 flat mirror none:
MC3 0.1753 flat mirror none:
MC2 13.4587 curved mirror ROC: 17.8700 (m)
Lens1 28.8172 lens focalLength: 1.7183(m)
BS2 29.9475 flat mirror none:
First Mirror 30.0237 flat mirror none:
Lens3 30.1253 lens focalLength: -0.100 (m)
Lens2 30.1635 lens focalLength: 0.1250(m)
WFS1 30.2269 flat mirror none:
Second Mirror 30.2650 flat mirror none:
Third Mirror 30.5698 flat mirror none:
Lens4 30.8113 lens focalLength: -0.075 (m)
WFS2 31.0778 flat mirror none:
In the first image attached below is the a la mode solution that show the waist size in the first WFS, and I used that solution to calculate the solution of the waist size for the second WFS, which is shown in figure 2. I photoshop a picture to illustrate how the new setup it supposed to look like.