With Dan Chen, Yuli Liang, Jinshui Tian

We continued the work from the previous day. (37183)

Before starting the work, we recorded the alignment of the current YPcal laser using the previously prepared reference setup.

We reduced the power of the main beam path of new laser using HWP before performing the alignment work.

We aligned the beam from the new laser and successfully extracted it from the Tx module.

At the end of the work, we turned on the current laser and checked the beam position on the RxPD. 

No significant change was observed, indicating that the installation and alignment work had not affected the alignment of the existing laser.