Simon, Pengbo

Last friday and today, we measured the beam profile after install the FI.

First time we didn't change the distance between the telosocpe, the result is: w = 0.0582+/- 0.0009mm, z_position = 56.54+/- 0.34 mm. ( Figure 1.)

Then we adjust the teloscope distance from 22cm to 23 cm by moving the first lens, the result is : 0.0512 +/-0.0012 mm, z_position = 30.45 +/- 0.34 mm.

the waist position is closer to the optical bench than before but the waist radius is just a little bit smaller than before.(Figure 2)