The components until the second layer were installed, and also 50:50 BS was installed. (attached picture 1 and 2) I also adjusted the lens and mirror position and angle, so that the beam is going as straight as possible.

Actually, I would like to measure the beam after BS to confirm everything is fine, but I broke the screw of beam profiler. I tried to replace the broken screw but seems not possible. (attached picture 3 and 4 are broken screw)

We could also just replace the mount. Up to now, I couldn't find a suitable mount. (See attached picture 5, 6 and 7)

Figure 5: sigma waveplate mount(originally we were using this)

Figure 6: connection part of the beam profiler

Figure 7: the wave plate mount(we usually use on bench, we have a lot but seems not suitable)