How to make a laser for a science project?
952580
http://www.ocf.berkeley.edu/~bramall/laserhowtohtml/laser_project/laser_intro.html\n\nThat's a danged powerful one and requires machining, I don't think I'd reccomend it for a science project but there it is and should give you basic laser info.\n\nActually building a working laser is probably more than most people would be looking at doing for a science project -- using a laser for something like holography (where you can use an off-the-shelf laser) might be a better project unless you are REALLY ambitious and willing to spend either a lot of time or a lot of money on the project.\n\nBTW, there used to be some books from TAB publishers about building your own lasers from surplus parts -- but I doubt most of the parts mentioned in them are available any more.  Still, it is worth checking out the science section of your local library to see.
200313
http://spaceplace.nasa.gov/en/kids/laser/index.shtml
134128
The first working laser was made by Theodore H. Maiman in 1960[2] at Hughes Research Laboratories in Malibu, California, beating several research teams including those of Townes at Columbia University, and Arthur L. Schawlow at Bell Labs. Maiman used a solid-state flashlamp-pumped synthetic ruby crystal to produce red laser light at 694 nanometres wavelength. Maiman's laser, however, was only capable of pulsed operation due to its three energy level transitions. Later in the same year the Iranian physicist Ali Javan, together with William Bennet and Donald Herriot, made the first gas laser using helium and neon. Javan later received the Albert Einstein Award in 1993.
372137
try this :\n\nhttp://www.makezine.com/blog/archive/2005/06/
1055664
You can do it with a laser a small circular obstacle (1cm diametre) and some lens. You built a telescope like picture to have 2cm diameter beam  you put the obstacle in front and you regard at 20 cm from the target
683251
I just helped my daughter with her science project. We made an electromagnet. Very easy to build and you can get buzzers, lights, and battery holders a your nearest hobby Lobby. you can also get toggle switches at the local hardware store. Mount it all on a nice piece of wood and your in business. by the way, my daughter took home first place!
263714
The best project will be one that has some interest to the 8th grader. So my granddaughter likes animals. But my youngest boy likes photography. So a pinhole camera would bore my granddaughter but would have caught the interest of my son.\n\nThat being said... Here's an easy one. Go to a store and find some cheap analog clocks (clocks with hands) that run on a single AA battery. Then go to Radio Shack and get some battery holders and some "aligator clip leads" -- short wires with clips on either side. And get a bunch of different brand batteries of different sizes (if you are trying to get by simply, use only AA batteries and then you just need the clocks and the batteries).\n\nTake off the battery covers and hook up the battery holders to the clocks with the clipleads (unless you are only using AA batteries). Then put batteries in and see how long it takes for the clocks to run down. This may take a long time. If you are short on time, try this. Get a flashlight bulb at radio shack and put it across the battery with the clock. So this way the battery is running the clock and the flashlight bulb at the same time. Note the time on the the clock and check it every day to see when the clock stops. You can graph the results easily.\n\nQuestions (form a hypothesis and answer one or more of these):\nWhat lasts longer, a AA, a C, or a D battery?\nWhat brand of battery lasts longer?\nWhat lasts longer, a standard carbon-zinc battery or an alkaline battery? What is the cost difference per unit? Per run time?\n\nA little research on the internet about how batteries are built, and the different technologies (carbon-zinc, alkaline, nicad, NiMh, lithium, lead-acid) and you have a great project.
904518
Light Amplification (by) Stimulated Emission (of) Radiation\n\nMany different types:\n\nRuby rod laser - basically a polished rod of aluminium oxide/chromium oxide (synthetic tuby), surrounded by apowerful flashtube.  - Visible Red\n\nNitrogen laser, co2 laser (gas lasers) fairly efficient by laser standards, inivisble output but can be strong enough to cut metal\n\nsemiconductor - both invisible and red - cheap for low power\n\ndpss  -  diode pumped solid state - these lasers use a "pump" diode which is usually 808nm, tis goes into a sliver of something called vanadate which take in light at 808bm (almost invisible Infra Red) and re-emit it at 1064nM (Invisible. It is then put through a crystal of KTP which halves the wavelength (doubling the frequency) and re-emits at 532nM - bright green
1127088
You should watch the episode of mythbusters where they try to build a death ray with mirrors and need a focal point, they make a mirrior in a contact sorta shape and the light focases on it. if you could make a solar cell like that maybe it would work. The episode was on all weekend, it might be helpful for some other things too!
422752
Smoke or fog will work.  There are also 100mW red lasers out there (wickedlasers.com should do the trick) that have some visibility in daylight, but this always depends on there being something (even the tiniest amount of dust) in the air to scatter off of.
128889
Here ya go!\n\nhttp://science.howstuffworks.com/laser.htm
896744
I've never heard of an astronomy laser but if you mean one for pointing out the stars, a normal laser pointer will work.
658850
you can try total internal reflection of light using a keychain laser (commonly availble) and tub filled with water. all you have to do is put a small piece of mirror in the tub filled with water, let laser fall upon it. see the trajectory of the reflected beam ofr different orintations/angle of reflections and you will find that for certain critical angle the reflected beam is trapped in the water due to the internal reflection of the laser. you can do the same thing by choosing a transparent bottle with a small hole on the curved surface close to the base. now fill it with water, and see that water flows out of the hole in a parabolic fashion, now shine the laser from the opposite side to illuminate the water column. take a white plastic sheet allow the water to fall upon it, you will find that the water emmits light. this also explains how fibre optics work.
78938
Try this link :)\nhttp://www.scienceproject.com/
1027156
A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The verb to lase means "to produce coherent light" or possibly "to apply laser light to", and is a back-formation of the term laser.\n\nLaser light is typically near-monochromatic, i.e. consisting of a single wavelength or color, and emitted in a narrow beam. This is in contrast to common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.\n\nLaser action is explained by the theories of quantum mechanics and thermodynamics. Many materials have been found to have the required characteristics to form the laser gain medium needed to power a laser, and these have led to the invention of many types of lasers with different characteristics suitable for different applications.\n\nThe laser was proposed as a variation of the maser principle in the late 1950s, and the first laser was demonstrated in 1960. Since that time, laser manufacturing has become a multi-billion dollar industry, and the laser has found applications in fields including science, industry, medicine, and consumer electronics.
456185
>you could get black peices of paper and little flashlights for you kids turn the classroom lights out and have the kids move their peice of paper over the flashlight and have them see that the light comes around the edges \nInstuctions\nMaterials\n>popsicle sticks\n>glue or tape\n>black peice pf paper \n>scissors \n>flashlight\nDirections\n>out line the inner circle of the flashlight\n>cut on that line\n>glue or tape a popsicle stick on the black peice of paper\n>turn on the flashlight and move the black peice of paper in front of the flashlight\n\n>this is what my second grade teacher did and i had a ball
708353
Hmm. . its pretty rare stuff so you are not going to hand out samples\nSince it was once used in lasers you could start your presentation with a laser light show, or just a simple laser pointer\nPresent the information chronologically, show how and why it was discovered (it started as a blank square on the Periodic Table of the Elelments) talk about it uses and why it was replaced\ngood luck