We found the beat at 1064nm. T(PSL)=26.59deg, T(X-end)=31.15deg.
The X-end laser was moved to the PSL table.
The beating setup was quickly constructed with mode matching based on beam profile measurements by the IR cards.
We used the 1GHz BW PD, Newfocus #1611-FS-AC.
As soon as we swept the Xtal temp of the X-end laser, we found the strong beating.