AT M1 aberrations

sect:ctb-1-1-7-pupil-plane-optics-01

M1 is close to a pupil plane, and the beam wander is relatively small.

Property	Value
Beam diameter	?
Beam walk	? $\mbox{ mm arcsec}^{-1}$
Surface roughness	?
Beam diameter	$1800/mbox{ mm}$