Kevin Jacobson

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Do you think my plan for a homemade laser will work? PLEASE RESPOND SO I CAN IMPROVE MY PLAN.

Lately, I've been thinking. When school starts, I will be in 8th grade which means that will be the year when my class get's it's first science fair. I've been studying lasers for the past week and I have found that lasers are actually quite simple. You simply have a light or electrical source energize a gas or solid causing a shift in the electrons in the atoms, thus releasing energy as a photon. The photons released are bounced in a straight line between a fully reflective mirror and a partially reflective lens which allows some light to escape, i.e., laser light. And then the light is focused with concave lenses. Well, my plan simply calls for an electric coil to surround a vacuum tube filled with nothing but Helium and neon. The electricity will travel between the coil and the gas, thus energizing the gas and releasing photons. On one side of the vacuum tube, there would be a simple mirror and on the other, a glass sheet with a slightly white tinge to reflect photons but still allow some to pass through, i.e., laser light. Then, there would be a series of concave lenses with spaces in between them filled with Helium and Neon so that the laser would gain strength as it leaves the source by causing similar reactions in the other gas chambers like in the original diode only not as strong but enough to further strengthen the beam by increasing the number of photons and then focusing them. I don't know how many of you know this much about lasers, but if you see any flaws in my plan, then please tell me so I can modify my schematics.

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    Jul 16 2012: Can an eighth-grade science project utilize electric power?
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    Jul 16 2012: Have you looked at magazines like Popular Mechanics? As science fairs as well as hobbyists have a long pedigree, I'd have thought you could find plans online. Using such plans and tinkering off of such plans is as legitimate for a school fair as seeking advice from people.
    Google search just gave me 3.83 million hits for "homemade laser plan."
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      Jul 16 2012: Fritzie,
      You might want to narrow that search??? :>) I just could not resist! OK....I'll bow out gracefully now...I'm about as right brain dominant as a person can be, and science/math has always been elusive to me....have fun Kevin...you continue to amaze me...did you check out that teen site yet? You are a GREAT influence for other teens...and some old adults like me!!!:>)
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      Jul 16 2012: Fritzie, unfortunately, you can only find plans to remove diodes from CD players or hack flashlights. I'm talking about making my own diode.
  • Jul 16 2012: If the vacuum tube is the size of a tube from a vacuum, u'll need a lot of power. I would suggest going with AC, not batteries. And make it a death laser. They are WAAAY more fun ;). Just kidding, of course. it sounds ok, the only thing that I can say is start small and if it works you can work your way up to something big enough to impress all of those junior high chicks. ;)
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      Jul 16 2012: How do you provide A/C? I would supply D/C by interlocking 11 9 volt batteries, which I have calculated and actually wouldn't take up much space at all. Thanks for the suggestion.
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        Jul 16 2012: Kevin, you are smart so I have no doubt it would work. My only question is: Why do you want one?
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          Jul 16 2012: For my school science project next year and I also want to just be the only kid in my school that can say they made a laser rifle.