Zach has just replied, and said that we should feel free to take the laser from his iodine setup in the West Bridge subbasement, in the ATF lab.
Annalisa, please ask Koji or Tara to show you where it is, and help you bring it to the 40m. You should install it (temporarily) on the PSL table, measure the waist, and find the beat in IR. Elog 3755 and elog 3759 have some of the details on how it has been done in the past.
Ok, I'm going to contact Koji.