[ATM] Quartz test

[Arjan te Marvelde]

Dale,

Do you think that the resulting wavefront is going to be flat enough to be
used as reference?
The mirror should not ony be bigger, but also of better quality than the one
under test.

   Arjan

> So you can use another telescope and a point light
> source (laser) to make an artificial star.  It works
> as long at the other telescope you use is as least as
> big and preferably bigger than the mirror you are
> trying to test.
>
> You may have heard of a collimator before.  One way to
> make one is the above description.