Some notes on aligning the laser through the beam transport.
Will add pictures and clearer descriptions in a bit. This is just based on some quick notes I made when Henrik showed me the ropes.
- Find reference numbers in e-log: search 'alignment' and find a table with pixel coordinates, cameras, motors etc.
It looks like this:
Note the coordinates are for NEGATIVE, NEGATIVE which indicates the direction of the axes.
...
Now after aligning the HeNe, we can proceed with using the IR laser and overlapping its beam path with the HeNe.
- Block HeNe in laser room
- Close Iris near the DM to 'Align'
- Open shutter on Laser → LI20→ Laser and then the shutter next to LSS EPS EPICS from High to Low
- Look at beam on B0 and B1 and use M4 and M5 in Laser room 2 tab to align to same reference coordinates as before.
Note that one might have to iterate a few times. - Might have to change polarization to see a good signal on B1 (wave plate)
- After alignment, reset wave plate and set iris back to nominal beam size.