Yuefan and Yuhang

We did beam height measurement on the bench and the result is reported here. However, we could see that the beam is still not flat at the height of 76mm. So we adjusted beam height again. After the adjustment, the beam height after AOM and until the last steering mirror is maintained at the level of 76mm.

After this activity, we aligned the filter cavity again. And the reflected green beam seems to be better. We think at this point, we should turn the work to design and implement the final telescope for AA telescope. We also measured the reflected beam. The result is attached and Yuefan will use this result to design the new AA telescope.