Re: [ATM] holographic null test on round robin mirror C

["matt" <mariusrf@bellsouth.net>]

-----Original Message-----
From: Nils Olof Carlin <nilsolof.carlin@telia.com>
To: atm@atmlist.net <atm@atmlist.net>
Date: Friday, February 04, 2005 11:34 AM
Subject: Re: [ATM] holographic null test on round robin mirror C


>matt tudor wrote:
>
>
>
>
>> With all the talk about the holo[g]raphic null test, what about a more
>modern
>> version of a Hartman test ? All it takes is a mask in front of a ccd
>camera
>> . A precision metal mask can be made for very little money . The rest is
>> calibration and software .
>
>This may sound attractive - but you should not forget to estimate the kind
>of precision you are out to get. A tilt of one wavelength over a 2" zone is
>about 1/100 000 - you need to better this by a factor 10 at least - a few
>microns over a ROC of a few meters! Or for that matter, the diffraction
peak
>from a zone, measured to a precision of some 1/10 of its width. I can't
>imagine Shack-Hartmann doing that - or am I wrong?
>

there are probably two dozen professional wavefront sensor companies making
these . Applications are adaptive optics for astronomy , vision through high
turbidity refractive media, ophtalmology .
Here is a link to a tutorial that explains the technology and its limits:
http://www.spiricon.com/pdf/wavefront_tutorial.pdf

best regards,
matt tudor

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