The purpose of this document is to collect pictures, notes, documentation, of the HAM3 chamber as built in L1.
L1 installed a 90/10 beam splitter in front of the POP QPD sled in order to allow operation at input power higher than 10W.
A picture of the ISC path in HAM3 is here: https://alog.ligo-la.caltech.edu/aLOG/uploads/9787_20131119142329_IMG_0099.jpg