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You can also use water-filled plexiglas prisms. These are much larger and much cheaper than glass prisms and create a pretty good spectrum. Available from Edmunds Scientific among other places.
On May 29, 2013, at 8:29 AM, Erich Rose wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
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>
> A diffraction grating would work best for capturing a larger beam of light. You can get it in large plastic sheets from folks like Edmunds. But if you are using something like a theater spot you will have to be careful about heat. These new high intensity LED spot lights could be an alternative.
>
> If you want something very specific you could find a holographer and have a custom designed grating created. Holograms are just extremely complicated* diffraction gratings. It would allow you to design for a very specific set of angles and dispersion. You can also record multiple angles and make something that works better as the sun changes positions.
>
> * Not complicated to make, just complicated in density of information recorded.
>
> Erich
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> On May 29, 2013, at 10:15 AM, Jeff Rosenblatt <[log in to unmask]> wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>> Incorporated, a worldwide network of science museums and related institutions.
>> *****************************************************************************
>>
>> We want to diffract sunlight, or theater/stage white lights, into a nice rainbow pattern on the floor, from about 10-15' height above.
>>
>> Does anybody know good supply sources for large prisms, or does a special diffraction gradient sheet work as well?
>>
>> Thanks in advance for any feedback.
>>
>> --Jeff--
>>
>> Jeff Rosenblatt
>> Director, Science City & Gottlieb Planetarium
>> Kansas City's Science Center
>>
>> Union Station Kansas City, Inc.
>> 30 W. Pershing Rd. Suite 400
>> Kansas City, MO 64108
>> Office: 816-460-2218
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