Old 09-13-2009, 03:07 AM #1
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Default Looking for a disk, circle or ring laser pointer

Searching for laser pointers on the web i came across this site. I am not even sure if its possiable so i decided to post and ask the experts.

Anyway what i am looking for is a hand held pointer that would project a ring, or even a small disk. So a solid circle or just the perimeter. i have been looking for a while and i cant seem to find one is there such a thing?


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Old 09-13-2009, 03:08 AM #2
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Default Re: Looking for a disk, circle or ring laser pointer

yeah just use a diffraction grating. the cheap 5mw reds from your local dollar store might have one.
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Old 09-13-2009, 03:35 AM #3
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Default Re: Looking for a disk, circle or ring laser pointer

Thanks sounds easy enough

I guess my other need would be that the laser point is only going to be used from 1 ft - 2 ft distance and i would need atleast a 2 inch - 10 inch ring in that distance. Obviously it will expand and shrink depending on distance but i assume most pointers are ment to be used from 10-20 feet away.

Either way im still looking on websites i havent found exactlly what i want yet.
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Old 09-13-2009, 03:50 AM #4
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Default Re: Looking for a disk, circle or ring laser pointer

omg easy! get a small mirror, attach it to a small motor and point the laser at it! its called a spirograph!

you can see how to make one here! YouTube - Laser Kaleidoscope - Featured on MAKE (this one uses 2 motors to make patterns)

you can see another one here http://laserpointerforums.com/f48/gr...aph-42151.html

or my personal favorite! http://laserpointerforums.com/f48/mo...ion-33293.html

hope that helped! -Adrian
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Old 09-13-2009, 05:58 PM #5
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Default Re: Looking for a disk, circle or ring laser pointer

well, much easier for the solid disk:
un-focus your laser! depends on what laser it is, of course. alternatively, you can mount a long-focus-length (="weak") lens in front of your laser, enlarging the dot.
but yes, i would get a 1$ pointer with dozens of useless pattern-heads ;-)

a circle will be much more visible than a solid disk, obviously!

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Old 09-14-2009, 03:22 AM #6
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Default Re: Looking for a disk, circle or ring laser pointer

...you could unfocus a laser and then put something on the center of the lens to block the light, so you only get a ring instead of a dot.
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Old 09-14-2009, 05:41 AM #7
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Default Re: Looking for a disk, circle or ring laser pointer

Quote:
Originally Posted by Mohrenberg View Post
...you could unfocus a laser and then put something on the center of the lens to block the light, so you only get a ring instead of a dot.
You still loose power that way, not like a diffraction grating or mirror/motor.
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