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Old 06-26-2009, 01:55 PM #1
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Default mark on paper with laser

I am trying to produce a piece of paper which is coated which is not
effected by daylight but when a light wave of 630-670nm is pointed at
it will leave a permanent mark i.e. black dot on white background.

Can you advise me how I could achieve this or if you could guide me in
the right direction. Thank you

mark


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Old 06-26-2009, 02:07 PM #2
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Default Re: mark on paper with laser

This depends on many things..
From what distance do you wish to be able to produce this dot?
Should it be instant or can it take some time?
Should the dot be tiny and precise or visible?
Is the laser allowed to be quite powerful?
Is it very important that only these wavelengths can affect the paper?
If you could explain what the purpose and requirements are, answering questions such as those I have given above, it will be much easier for us to provide you with answers.

It sounds like a very interesting project!
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Old 06-26-2009, 02:17 PM #3
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Default Re: mark on paper with laser

HI
from 5 metres to as far as possible, obviously ther will be a limit.

To a count of 3 to 5 sec if possible.

The size of the beam, precise and visible mark.

power low- must be effected by 630-670nm only give 20-30nm.

I was thinking either chemical reaction or photoluminescence. Plastic film over paper ?
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Old 06-26-2009, 06:12 PM #4
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Default Re: mark on paper with laser

the wave length you chose is gonna be super hard to burn/mark on white paper. it reflects a lot of the wavelength. you would need a ton of power. but if you were flexible on laser color you could have dramatically better and more efficient results with a laser in the 405nm range. and the 405nm will also be perfect for your photoluminesence/flouresing.
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Old 06-26-2009, 10:55 PM #5
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Default Re: mark on paper with laser

the paper that stores use for their receipt's will make a black mark when lased. It has to be focused though.
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Old 06-26-2009, 10:59 PM #6
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Default Re: mark on paper with laser

Or you could just use a blu-ray and colored paper. I can write full words with my blu-ray on any colored paper, and it's not even 100mW. White paper is the only hard paper to do.

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Old 06-26-2009, 11:02 PM #7
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Default Re: mark on paper with laser

Double post
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Old 06-26-2009, 11:02 PM #8
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Default Re: mark on paper with laser

You can try Heat sensitive paper. I was thinking of the old stuff from fax machines but it looks like there are all kinds.

Heat-Sensitive Paper at Educational Innovations

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Old 06-27-2009, 05:17 AM #9
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Default Re: mark on paper with laser

630-670nm is included in the daylight spectrum.
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Old 06-27-2009, 06:06 AM #10
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Default Re: mark on paper with laser

How about try photographic paper... but this would involve you developing the paper in some chemicals.. developer, fixer and water bath (if i remeber correctly). this is probably the easiest way... only thing is that the photographic paper is not effected by red light.. so you could try green, blue or any other colour you can think of or afford....

Hope that helped

-Adrian
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Old 06-27-2009, 02:18 PM #11
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Default Re: mark on paper with laser

Still won't work in daylight.
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Old 06-27-2009, 08:45 PM #12
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Default Re: mark on paper with laser

I saw something about this awile back. Somebody had squares of flourescent materiel with a blacklight behind them. Then they wrote on it with a red laser.

YouTube - IR laser viewing plate

Read the description... They acually did it with a red laser and goggles over the camera.
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Old 06-28-2009, 03:54 AM #13
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Default Re: mark on paper with laser

Amazon.com: 4 in 1 Laser Pointer - PDA Stylus - LED Light - Pen: Electronics

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Old 06-28-2009, 04:08 PM #14
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Default Re: mark on paper with laser

Quote:
Originally Posted by Laser_Ben View Post
GENIOUS! I never would have thought of that.
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Old 06-29-2009, 09:26 AM #15
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Default Re: mark on paper with laser

can you place a filter over a laser?

to get the right wave length of beam?

I would prefer a chemical reaction of some kind, as photoluminescence does not last?
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