Re: [ATM] Bench star test

["Stephen Koehler" <s.c.koehler@gmail.com>]

Vladimir,

> If "point source" is considered to be good approximation for
> source of spherical wavefront than, I  think,
> laser diode (lensless) has lot of aberrations in spite of its small size.
> Astigmatism, for example.

>From postings here and on the interferometry group, it looks like
laser diodes are plenty small enough (i.e., smaller than Airy disk
size for typical applications).  I believe the small size implies a
clean, spherical wavefront.  For the same reason, the pinhole in a
point diffraction interferometer produces a spherical wave, regardless
of the quality of the wave that enters the pinhole.  Someone please
correct me if I'm wrong here.

-- 
Steve Koehler
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