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Old 10-29-2014, 11:50 PM #1
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Default Newbi Questions

Hello all,

I've been looking up lasers for a few months and seem to have run into a dead end. I'm looking for information on those old laser pointers from probably 15 years ago. They had attachment lens's that could make pictures or messages on the wall. My questions is what that is called... a diffraction lens? That's the closest i have come up with but no Google searches for diffraction lens's have provided the results i need.

The end goal is a cheep laser that can produce my company's logo on the wall during daylight. And do it safely. I know that might sound cheesy but for my application it will work great.

Further questions.

I'm also looking for a company who can produce such lens's/lasers.
whats the best color for daylight?
whats the best power i need it to be seen but not a safety hazard?
would an LED be cheaper or more effective?
lastly does anyone know a good place that can provide a working prototype once i have the specifications down?

Any help is appreciated.

~cris



Last edited by cris; 10-29-2014 at 11:51 PM.
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Old 10-30-2014, 04:39 AM #2
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Default Re: Newbi Questions

Quote:
Originally Posted by cris View Post
Hello all,

I've been looking up lasers for a few months and seem to have run into a dead end. I'm looking for information on those old laser pointers from probably 15 years ago. They had attachment lens's that could make pictures or messages on the wall. My questions is what that is called... a diffraction lens? That's the closest i have come up with but no Google searches for diffraction lens's have provided the results i need.
They are called diffraction gratings or star
caps.

Quote:
Originally Posted by cris View Post
The end goal is a cheep laser that can produce my company's logo on the wall during daylight. And do it safely. I know that might sound cheesy but for my application it will work great.
A custom grating will cost hundreds of
dollars at the very least. It can be done,
but it's a matter of hunting down a company
that can/will do it for you. A projector
would be easier, look better, and possibly
be cheaper.

Quote:
Originally Posted by cris View Post
Further questions.

whats the best color for daylight?
Green

Quote:
Originally Posted by cris View Post
whats the best power i need it to be seen but not a safety hazard?
There is no simple answer to that
question. Since this is a projection, we
are talking power DENSITY and it depends
how large, what type, and how close
untrained individuals can get to the source.

Quote:
Originally Posted by cris View Post
would an LED be cheaper or more effective?
Yes, most likely yes, and definitely safer
with less legal issues/restrictions.

Quote:
Originally Posted by cris View Post
lastly does anyone know a good place that can provide a working prototype once i have the specifications down?
There are members here who have built
projectors and can help you out.

Last edited by The Lightning Stalker; 10-30-2014 at 04:59 AM.
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Old 11-02-2014, 07:56 AM #3
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Default Re: Newbi Questions

Nevermind....

Goodluck bud always like seeing folks taking an interest in such a promising field and hobby.
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Last edited by xirrious; 11-03-2014 at 06:52 AM.
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Old 12-28-2014, 08:35 PM #4
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Default Re: Newbi Questions

The projector idea seems best to me for two reasons, easy to do and the effect will be awesome, if you could somehow position it to where someone can't get in front of it. The diffraction grating could work, finding someone to make custom gratings is also an awesome idea, if you can, but I believe a projector would do a far more beautiful job and have multicolor options you won't get otherwise.
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Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

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Last edited by Alaskan; 12-28-2014 at 08:35 PM.
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