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Originally posted by jfj123
Please find any instance where a laser can produce darkness and post it for me.
And we're right back where we're started in that you can't create darkness with light.
Those are wonderful statements and all but are meaningless without any evidence to support them.
Originally posted by ipsedixit
reply to post by jfj123
I've pretty well said all I have to say on the subject of color and you are repeating yourself.
If you look at a representation of the spectrum and look at the indigo portion of the spectrum, you will see that it appears darker than the other colours. It is still light but to the eye it appears darker than yellow for example.
A tremendous amout of contrast can be obtained by artfully placing dots of color from the spectrum.
Originally posted by jfj123
I see what you're saying but what you're missing is the actual projection of darkness on light.
Originally posted by ipsedixit
Originally posted by jfj123
I see what you're saying but what you're missing is the actual projection of darkness on light.
I'm saying that "darkness", as you call it, can be suggested very convincingly to the eye by choosing colors from the visible spectrum. This is done all the time in art, on television screens etc.
The trick in a hologram would be to project the appropriate colors in close proximity to one another so that they are perceived as dark.
The main point is already shown. A holographic style image can be projected in air with nothing acting as a screen.
If science is able to achieve the projection of all colors of the visible spectrum in air, then there is no limit to the kind of images they can project. The "darkness" issue is irrelevant.
[edit on 5-9-2008 by ipsedixit]
Originally posted by jfj123
So you're saying that with a flashlight and some colored lenses, you can create a patch of darkness in the middle of the day?
Originally posted by ipsedixit
Originally posted by jfj123
So you're saying that with a flashlight and some colored lenses, you can create a patch of darkness in the middle of the day?
Flashlights are irrelevant here. Remember we are at the stage of utilizing plasmas created by focusing lasers.
If science can create colored plasmas, through whatever means in the full spectrum of visual light, in the process of making their holographic images, then there is no limit to the sort of image they could project.
Originally posted by djeminy
From page 123:
".....
These programs will also explore a combination of microelectromechanical systems (MEMS) based electro-optic spatial light modulators in combination with very short pulse solid state lasers to provide powerful new capabilities for secure communication up-links (multi-gigabits per second), aberration free 3-dimensional imaging and targeting at very long ranges (> 1000 kilometers). Lastly, innovative design concepts and system integration of MEMS-based spatial light modulators (SLMs), that provide a quantum leap in wavefront control, photonics and high speed electronics, will be explored for an affordable and high value communications, image sensing and targeting system for use well into the 21st century."
Originally posted by jfj123
Originally posted by djeminy
From page 123:
".....
These programs will also explore a combination of microelectromechanical systems (MEMS) based electro-optic spatial light modulators in combination with very short pulse solid state lasers to provide powerful new capabilities for secure communication up-links (multi-gigabits per second), aberration free 3-dimensional imaging and targeting at very long ranges (> 1000 kilometers). Lastly, innovative design concepts and system integration of MEMS-based spatial light modulators (SLMs), that provide a quantum leap in wavefront control, photonics and high speed electronics, will be explored for an affordable and high value communications, image sensing and targeting system for use well into the 21st century."
excellent now please describe this in laymans terms and in detail.