The aluminised spot on the null lens works like a charm! Now we can get good fringes from both the front & back faces of the lens with the 94%-reflective reference mirror we need to use to test M2.
It turns out we need more coarse adjustability in decentre for the null lens so an extra set of screws was added to the flexures...
& it really helps to be able to adjust the interferometer, fold mirror & null lens as a unit once they've all been aligned with each other. Mods were thus made to the whole M2 test frame to make it adjustable in tip, tilt & decentre.
Pity Ockert's found out where the most comfortable parking spot in the clean room is - now we're gonna have to fight over it...
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