Re: ATM Laser Artifical Star

[Bob Goff <goffaxe@azstarnet.com>]

Hugues,

I must forgive you for you know not of what you speak. I refinished a 1.25M
f3.02 using a set of corrector lenses no larger than 75 mm for the big one
and 60 mm for the small one.

Bob


At 09:57 AM 08/31/2001 +0200, you wrote:
>
>
>
>>> Since some of us-- even large organizations like NASA and Perkin-Elmer--
>>> are not affluent enough to have a 150 foot optical testing tunnel, you
>may
>>> now better understand why the null test was invented and appreciate its
>>> contribution to our art!
>>>
>>> . . . Richard
>>
>>I believe the original posting was about using a laser and a lens. With
>the lens you can convert the >spherical wavefront exiting from the laser
>into a parallel one, thus imitating an artificial star at >infinity. There
>would be no need for a 150 foot tunnel, somewhere in the order of the FL
>would suffice.
>>
>>Did i miss something?
>>
>> ... Arjan te Marvelde
>
>True, but stricly speaking you need a lens of high quality and of
>the same size as or larger than the mirror to be tested...
>BTW, I wonder how they tested optics like those of the Kecks
>or the VLT... Must be monstruous!
>
>Hugues
>
>
>
>
>
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