Paticipants : Yuhang

After some troubles to design the telescope, we finally found a convenient solution :

use 2 steerings mirrors to have the beam tranmitted by the 98:2 at the nominal height (75 mm)

Install a lambda/2 and replacing one steering mirror by a pbsw : power is now 14mW which is low enough to have the beam waist inside the EOM ( the ihgher limit is 18.1 mW)

We installed a beam dump to get rid of the spurious reflection of the (wedged) pbsw.

use one f=100mm lens to obtain a good beam size inside the EOM. It was installed on a rail in prevision for some EOM induced astigmatism.

The last picture shows the setup before installing the EOM 4 holes away of the lens on the rail.

The first figure is a fit of the beam after installing the lens.

(following is comparison of W and V profiles)

difference in waist position : 4mm

difference in waist size : 1.3 um

The second one is a fit after installing the EOM.

(following is comparison of W and V profiles)

difference in waist position : 2mm

difference in waist size : 2 um

The installation of the EOM changed the beam waists sizes by 2um and beam waists positions by 2 mm