TEM00 and the space for new laser

Yesterday I finished the alignment. Today when we tried to clean up the central room, found the beam splitter in one box, so I divided the transmitted beam from the cavity into two part, one received by the PD to see the spectrum and the other received by the camera to see the mode shape. For now from the first picture, the highest peak is the TEM00. But the problem is the height of the peak is very sensitive. I connected the cavity to the thermal control to stabilize to some extent, but if I touch the table or the mirror, it changed a lot. And it seems also a slow change with time exist.
Today we clean up the unused part of the optical bench for the two lasers, and we found a rack for the power supply. The arrangement shows in the second picture.