impossible black laser?..

photonaholic said:

Mine puts out flaming matches and re inflates balloons .

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Lmao :crackup::crackup::crackup:

Woodofcville said:

I wish there was a way to subtract light from a place... A darkness emitting device?

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http://en.wikipedia.org/wiki/Black_hole

Now if only you could stuff that cosmic event into a pointer size package, I would be scared to push the button on it though.

StridAst said:

As an interesting thought, all matter is energy, and everything we can directly see in this universe is this energy all of which is normal or positive energy. But there is definitely negative energy, it's existence inferred by the accelerating expansion of the universe. if there is negative energy, then I wonder if there is "negative matter" and therefore negative photons............ Just a thought.

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I think you're thinking of Dark Energy when you say negative energy, because THAT is what is hypothetically accelerating the expansion of the universe. Also I think you may be thinking that photons are a form of matter...this is not the case; photons are strictly energy. Although it is interesting to note that matter itself is merely just another form of energy (You can thank Einstein for figuring that one out ).

As far as "negative matter", that does exist, it's called antimatter; without going into too much detail it's basically the exact opposite of all matter (ie a positron is the antimatter equivalent of an electron). When matter and antimatter meet they "annihilate" converting 100% of the mass into energy: X-ray and Gamma-ray photons (It is interesting to note that nuclear fission is only about .7% efficient in turning mass into energy). Antimatter is incredibly hard to produce in any quantity, (for any "reasonable" quantity you need obscenely large supercolliders like the Large Hadron Collider at CERN), but they are used in many hospital in PET scanning equipment. (Positron emission tomography - Wikipedia, the free encyclopedia)
People have theorized antimatter's use as the ultimate weapon or power source, since even a gram of Antimatter could theoretically produce more power than humans have ever utilized. But for us to use it there would have to be a significant breakthrough in Antimatter production, currently the cost is about $62.5 trillion per gram for antihydrogen. It costs CERN about 100 million dollars to produce one BILLIONTH of a gram of antimatter.

Anyway in the subject of something more laser related..."antiphotons" do actually exist since, as StridAst mentioned, all forms of energy have opposite forms. The disappointing part is that they are exactly the same in all noticeable physical properties to photons, their "components" are just reversed in charge. photons, like neutrons, must always be neutral. Therefore even if a laser strictly emitted "antiphotons" it would be indistinguishable in nearly every way from a normal laser.

I'm not sure that a "black laser" in the traditional sense is possible, since, as many have mentioned, it would have to be a beam bereft of photons entirely...which seems paradoxical. The only way I could think of making a "beam" of black would be firing ideal, effectively massless black bodies in a controlled manner...But that doesn't seem very practical either since black bodies don't actually exist haha.

Excuse the obscenely long post but I find all of this rather fascinating. (I'm going to college soon to be a physics major.)
Links:
Antimatter - Wikipedia, the free encyclopedia
Ask the Van - Illinois Dept. of Physics

I tested my black laser and the power meter says its minus 100mw!

photonaholic said:

I tested my black laser and the power meter says its minus 100mw!

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Wierd i tested mine and it disappeared :thinking:

In a simple phrase : If you zoom into the the sky you can see that we are surounded by dark matter 24 hours a day,... In this dark matter the sun, the planets, stars etc. looks verry small compared to the volume,... of the dark matter. Isn't that incredible ?

Nanolaser said:

In a simple phrase : If you zoom into the the sky you can see that we are surounded by dark matter 24 hours a day,... In this dark matter the sun, the planets, stars etc. looks verry small compared to the volume,... of the dark matter. Isn't that incredible ?

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Incredible? Entirely. Especially since we have yet to conclusively prove WHAT dark matter is; currently our best bet are what physicists call WIMPs: Weakly interacting massive particles - Wikipedia, the free encyclopedia

If you're at all interested in any of this I suggest you read up on how they detect these particles, it involves some of the toughest engineering problems in experimental physics, and our best efforts have yet to prove all that much. (statistically significantly anyway)

Nanolaser said:

In a simple phrase : If you zoom into the the sky you can see that we are surounded by dark matter 24 hours a day,... In this dark matter the sun, the planets, stars etc. looks verry small compared to the volume,... of the dark matter. Isn't that incredible ?

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I think you have confused darkness or the lack of light as "dark matter" OOPS just noticed the sarcasm smiley... feel free to sarcasm me...

Even though outer space appears to be black, there is widely scattered light emanating from countless stars and reflections from planets, asteroids, Uranus and other space debris.

Lol I had forgotton this thread existed for over a week

I have to respond to this to clarify what I ment.

ninja_tux said:

I think you're thinking of Dark Energy when you say negative energy, because THAT is what is hypothetically accelerating the expansion of the universe. Also I think you may be thinking that photons are a form of matter...this is not the case; photons are strictly energy. Although it is interesting to note that matter itself is merely just another form of energy (You can thank Einstein for figuring that one out ).

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Yes I meant Dark Energy by saying "negative energy" I chose a different way to explain it for several reasons, mostly because it seemed the best way to get my point across without running afoul of all the other mismatched terminology in the science community. Also I am aware that photons have no mass, and therefore are not matter, but considering matter and energy are not truly separate as you pointed out, for the sake of this hypothesis, the difference is purely academic.

First dark energy as stated is what is hypothetically accelerating the expansion of the universe. This is a force that is acting opposite of gravity.

Now my wandering mind wonders, if all matter and energy are the same thing, and all matter and energy even antimatter exibit normal gravitational attraction, then any DARK energy is something that is not matter, energy or antimatter. Now if it is a true opposite to energy, then I wonder if there is a matter equivalent to dark energy. i.e. "matter is to energy" as "X is to dark energy" What then is a name for X? you can't call it dark matter to dark energy, after all, there already is something called dark matter, and it exhibits NORMAL gravitational attraction. In fact gravitational attraction at the galactic level is what requires it's existence in the first place. The supposition was essentially, As in the classic equation E is energy, then instead replace it with "De" for dark energy, so I wonder if there could be a De = mc², to be a counterpoint to the well known E = mc² ..... *shrug* if so, then you can't call it dark matter, that names already taken. you can't call it anti matter, as that name is already taken..... but the description "negative matter" is as far as I know, untaken, albeit not the best way to describe, as there is no negative charge connotations or anything, just a lack of a better term to describe a far fetched hypothetical concept....



Sorry for the lengthy post. I tend to ramble on.

P.S. I turned on my black laser, and shone it in my eyes. now I can see 20/20!!!!!!!!!!!!!!!!!!

With other words : when you see the black photons coming from the horizon it is the last thing you will see,...

photonaholic said:

Even though outer space appears to be black, there is widely scattered light emanating from countless stars and reflections from planets, asteroids, Uranus and other space debris.

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How bright is the light from Uranus? Did you accidentally sit on your laser???

I don't think I want any part of a space mission that involves cleaning space debris from Uranus.

Alchemist said:

How bright is the light from Uranus? Did you accidentally sit on your laser???

I don't think I want any part of a space mission that involves cleaning space debris from Uranus.

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-Trevor