As I mentioned in the entry, I moved the first lens after OPO. So the beam parameter going to filter cavity is changed. To have a better design for the telescope matching OPO transmission to filter cavity. I made the beam measurement again.

The way that I did measurement is illustrated in the attached figure 1. 

By measuring seven points along a long distance, I fit the beam. The result is shown in the attached figure 2.

The beam waist is even smaller than the last measurement.