1. The p-pol beam is very sensitive to the mirror mount. Even you touch the mirror mount, the alignmet condition will be changed.

2. The OPO's BAB transmission is also very sensitive to mirror mount.

3. The PLL locking is not robust enough. It can only last for several tens of minutes. And very diffcult to acquire, we can close and open software again to make this better.

4. The second Faraday's mount keeps moving. And its transmission has a lot of scattering.