Yuhang and Michael

We realigned the new OPO in ATC yesterday. The screws holding OPO input-coupling mirror are adjusted to maximize the alignment. After this adjustment, the first higher order modes are totally removed. This indicates that the OPO internal alignment is finally optimized.

The second order mode is still very high, but it looks to be a Lagurre mode. So this should be optimized by a better mode matching. It was checked that this mode is not a wrong polarization.

In ATC, we have a temperature controller. We can start to look for the best temperature for green production. In addition, when green beam can be found, we should also characterize its beam profile.