Today after I installed the first lens, I check the beam parameter. It is quite far from the simulation. Then I found the reason maybe I didn't use a correct distance before. (Also here I found 200mm lens disappears)

Then I measured the beam again and used the lens we have to design the telescope. However I cannot get any result.

So I decide to remove the first along the west edge. Then I peformed the measurement. Before do that I aligned the beams to make them flat and go through the center of the lens and mirror as well as possible. Then I measured the beam agian. The result is w0 = 850um, z0 = 3.05m(relative to the 0th hole of west edge of the bench).

Then I use the result and mode matching tool in Jammt(by using the lens we have, I just update the lens situation today). The target beam parameter is calculated last time. It is w0 = 390um, z0 = 0.8875(relative to the 0th hole of the west edge of the bench). 

The simulation result is f = 250mm @ z = 0.484m, f = 75mm @ z = 0.795m. I also check this result with the optical layout we have. It doesn't overlap with the mirror we have in the optical layout.