As a sanity check we measured the loss on the homodyne path on SQZT6: Loss = 10.7mW/430mW = 2.7% from 4 mirrors + beamsplitter + 3 lenses.

Seed power to homodyne = .430 mW (between measured between periscope mirror1 and periscope mirror2)

.272 mW. and .269 mW on each homodyne diode (seed + LO)
59.5 and 62.2 respectively on each diode (LO only).

Diode 1 seed =  272-59.5 = 212.5 ;   Diode 2 seed =  269-62.2 = 206.8: Total seed power on both diodes = 419.3

Loss = 10.7mW/430mW = 2.5% from 4 mirrors + beamsplitter + 3 lenses.

Note I discovered we currently have no beam dumps before homodyne for parasitic interferometry, this should be addressed but is unlikely to be the cause of our loss issue.