Hello! I am trying to align a bow-tie cavity and I noticed a behavior of the beam spot that I can't explain with my (limited) knowledge of cavities. For reference, I am scanning the current of the laser in order for the laser to follow the cavity. I attached below 3 frames from a video I took of the beam spot size (they are not consecutive frame, but the video is too long to upload). In the first frame, it is the way the beam spot looks like when (I think) I am well aligned. However I tried to rotate one of the mirrors quite a lot and the result is the following 2 frames. I expected that rotating the mirror would basically make everything disappear, as the beam doesn't replicate itself in the cavity anymore (I checked that one path is not enough to give any signal on the CCD camera I am using). However it looks like I have 2 independent beams which still (kinda) amplify in the cavity even when their path is quite far from the original (well-aligned) one. Why is this happening? Just as a side note, the 2 beams that appear seem to split smoothly from the original one. It is not like I have the nice 00 mode and then suddenly I change to a 10 mode. It literally behaves like in the first picture I have the 2 spots overlapped and then I slowly take them apart. Any insight would be appreciated. Thank you!