I saw this online and was wondering how if you were to shine the white laser through a projector would you have a laser projector?
http://rog8811.webs.com/whitelaserpointer.htm
I understand you would need to expand the beam to be the size of the LCD or DLP but if you did that would you have a projector that could be displayed as far as a laser could shoot? What do you guys think about this? Anyone want to build one and give it a try?
http://rog8811.webs.com/whitelaserpointer.htm
I understand you would need to expand the beam to be the size of the LCD or DLP but if you did that would you have a projector that could be displayed as far as a laser could shoot? What do you guys think about this? Anyone want to build one and give it a try?
You could certainly scan out the image with rotating or oscillating mirrors.
Most safe semiconductor laser put out less than a milliwatt. That seems bright when its just a pinpoint spot of light, but spread it out to illuminate a 50-inch screen and its not much light at all.
Most safe semiconductor laser put out less than a milliwatt. That seems bright when its just a pinpoint spot of light, but spread it out to illuminate a 50-inch screen and its not much light at all.
You think scanning is the only way to go? You don't think there is a way to use a lens to effectively spread the light to hit the sensors and then pass through the front lens to be projected? It's been a long time since I took a laser and holography class, I do remember there are lenses and mirrors that can do something like this but I don't remember if there were draw backs. I also know that the # of lumens needed from a white laser would be greatly reduced when compared to a standard bulb but I still don't know how much light would be needed.
If you are spreading it out, why use a laser at all? There are some very bright white LED systems around (Luxeon?).
because the way laser light and light from an LED behave very differently. Play with a red laser and it can shoot a very large distance and still be intense, then try to shine an LED across the same room. Laser light is very directional and coherent.
A laser projects far because the beam divergence is very small.
If you put it through a grating or whatever you use to spread it out to illiminate a whole screen, you have effectively diverged it.
It may still be coherent, but I cannot fathom how coherence is important in its use for a video projector.
If you put it through a grating or whatever you use to spread it out to illiminate a whole screen, you have effectively diverged it.
It may still be coherent, but I cannot fathom how coherence is important in its use for a video projector.
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