As shown in entry #1363, the error on the beam waist position is large ( around 8%).
I checked if the solution #3 of entry #1366 would be good also considering the border positions of beam waist in the error interval, running again the simulations (fig 1, 2, 3) and analyzing the robustness on Python.
Both focal lengths are 750 mm.
I summarize the results in the following table:
| z0 (m) | pos lens 1 (m) | pos lens 2 (m) | pos lens 1 at min mismatch (m) | pos lens 2 at min mismatch (m) | min mismatch (%) |
| 0.089 | 0.420 | 0.673 | 0.424 | 0.673 | 0.9 |
| 0.081 | 0.420 | 0.673 | 0.4276 | 0.683 | 1.8 |
| 0.097 | 0.420 | 0.673 | 0.410 | 0.6755 | 1.6 |
where the positions of the lenses is referred to the PBS after the OPO.
I computed on Python the position of the two lenses corresponding to the condition of minimum total mismatch.
In fig. 4, 5 and 6 are shown the robustness of the telescope with z=0.081 (min position), 0.089 (real position), 0.097 (max position), that are still pretty good (less than 10% mismatch).
