what is plasma,how it is produced using lasers?
100968
There's another kind of plasma, I think you mean what they call the fourth state of matter.\nPlasma consists of a collection of free moving electrons and ions (atoms that have lost electrons). They carry electrical currents and generate magnetic fields. Plasmas are the most common form of matter. \n\nMaybe you can get good information on how a laser produces plasma in this site:\nhttp://www.plasmas.org/technology.htm
128889
Here ya go!\n\nhttp://science.howstuffworks.com/laser.htm
1176218
A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. Laser 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\nhttp://en.wikipedia.org/wiki/Laser\nhttp://www.howstuffworks.com/laser.htm
329266
Plasma does not cast a shadow. Plasma is the extreme for of matter. Its the core of the sun but Plasma cannot cast a shadow.
711667
Yes and no. Plasma, in physics, is simply ionized gas. "Ionized" means that at least one electron has been dissociated from a proportion of the atoms,particle or molecules. The free electric charges make the plasma electrically conductive so that it responds strongly to electromagnetic fields.\nLightning would be and is plasma because lightning is basically charged particles flowing through the air. As it travels, it charges the air, and turns it into plasma.\nFire is just a form of energy that is not known to conduct electricity. Fire is not a form of plasma.
590426
A beam of laser light is shined on the target either by a ground unit in the area or by the aircraft which is targeting the place you want to bomb, then when the bomb is dropped it 'sees' the reflected laser light and maneuvers towards it with great precision (usually) by manipulating small movable fins on the bomb itself which guide it towards the intended target. BOOM, it's Miller time.
411070
Blood plasma is the liquid component of blood, in which the blood cells are suspended. Serum is the same as blood plasma except that clotting factors (such as fibrin) have been removed.\n\nPlasma resembles whey in appearance (transparent with a faint straw colour). It is mainly composed of water, blood proteins, and inorganic electrolytes. It serves as transport medium for glucose, lipids, hormones, metabolic end products, carbon dioxide and oxygen. (Oxygen transport capacity of plasma is much lower than that of the hemoglobin in the red blood cells; it may increase under hyperbaric conditions.) Plasma is the storage and transport medium of clotting factors and its protein content is necessary to maintain the oncotic pressure of the blood.\n\n*As a side note: you can also donate your plasma for money. Just look up clinics in your area.
202169
LASER is the acronym for "Light Amplification by Stimulated Emission of Radiation".  It is, first, a process that is explained by quantum mechanics and statistical mechanics.  At this point, it has come into common use, and can also refer to either the light or the device used to produce this type of light.  It does not have a higher energy than light produced by other means, as the energy only depends on the frequency of light.  It does have a higher intensity concentrated into a smaller area, and much higher coherency than light from the sun or a light bulb.\n\nAlso, all light, regardless of how it is produced, travels at approximately 300,000 km/sec in a vacuum.  That value does not differ from one type of light to another, or one color of light to another.
625872
Plasma is actually a superheated mixture of protons, neutrons and electrons. it occurs in the suns core which is at a temperature of around 15 million degrees celsius. this is also the plasma which is formed on the underside of a space ship during re-entry. in plasma there are no atoms or molecules. all the components of atoms are present separately. \n\nAND of course, no HALO didn't get its plasma guns from this plasma
699009
The largest and most powerful laser in the world is the NOVA laser. It is located at the Lawrence Livermore National Laboratory in California. The NOVA laser is about as long as a football field and is three stories high. The power of the NOVA laser is approximately 1.0 × 1014 watts (100 terawatts).\n\nLasers are devices which produce radiation with unique properties. It is these properties that distinguish laser radiation from the radiation produced by more familiar sources such as the sun or the common household electric light bulb.  When considering the safety implications of the laser beam an important parameter is the amount of power in the beam divided by the cross-sectional area of the beam. This is called the irradiance and is usually quoted in watts per square metre or W m-2.  So, yes, a laser can give off a lot of radiation.\n\nGenerally speaking lasers can be contained so they do not harm humans, and safety goggles are not even required.\n\nLaser stands for Light Amplification by the Stimulated Emission of Radiation. The word is commonly applied to a device that produces a beam of radiation in the optical part of the electromagnetic spectrum. A laser can be described as a variation on the fluorescent light tube by imagining a sealed tube, containing a gas or mixture of gases excited by some form of energy. \n\nInstead of gas, some lasers incorporate a solid material such as ruby, a liquid dye or chemicals. Different substances will produce beams of different wavelengths and colours. Lasers can vary considerably in size from devices that occupy a number of rooms to a tiny semiconductor chip.
234863
Well, their both right.  There's nothing in plasma that yo can see, unless you're looking through a scanning electron microscope.  Then you'd see the proteins. But with just a regular light microscope, you'd see light.  \nbauerspam takes it by a hair.
41453
well, lasers are not really simple, so there is not a simple answer unless you already know a lot about how they work.  so here is a somewhat-long answer:\n\nfirst of all - the point-like nature of a laser beam is not because it's coherent.  in physics we say the beam is well-collimated or that it has a small divergence.  this is because a laser is an optical cavity - whatever material emits the radiation always sits between 2 mirrors.  curious?  read on!\n\nthe way you make an optical cavity is basically take 2 mirrors and set them up parallel to each other, facing inwards.  tada, optical cavity.  ever been in a room with mirrors opposite walls, and seen an infinity of you stretching off into the distance?  you are inside an optical cavity.\n\nthe reason for the laser's high collimation is that the mirrors on either end of the optical cavity have to be very close to perfectly parallel for the laser to work.  have you ever been in one of those mirrored rooms and noticed that the multiple images of you seem to sorta drift off to one side until they go off the edge of the mirror?  that's because the mirrors aren't perfectly aligned.  if they were, you'd be able to see yourself alllll the way off into the distance.\n\ni'll come back to this in a second and first talk about how the rest of the laser works.\n\nthe laser works because of a process called "stimulated emission", which is the "SE" in LASER.  all lasers have a working medium - some kind of material that emits the light - sometimes it's a gas, sometimes a solid.  in the case of a little laser pointer, it's a semiconductor crystal.\n\nanyway, the way a laser works is you excite the atoms in the material so that one (or more) of its electrons are in an excited state - a higher energy level than usual.  if you can achieve a condition called a "population inversion" where MOST of the atoms in the material are excited, then lasing can start to occur.  in the case of a semiconductor laser pointer, you create this highly-excited state by connecting a voltage across the crystal, and this causes the electrons to jump to a higher level.\n\nanyway, what happens next is that some of the atoms will spontaneously revert back to the ground state.  in doing so, they will emit a packet of light called a photon, which has a wavelength that depends on the energy difference between the ground state and the excited state.\n\n\n(by the way, these random emissions are called "spontaneous" and are the way a flashlight works.  each atom in the lightbulb emits at random times, and in random directions and phases.  so the absence of the rest of the stuff i'm talking about here - the optical cavity and the stimulated emission - are what make a flashlight beam different.)\n\nif this photon happens to fly nearby ANOTHER excited atom, it interacts with that atom's excited electron and causes IT to decay and emit a photon.  and because the first photon caused the emission, the second photon comes off with the same phase and direction as the first photon.  that is, the first photon STIMULATED the emission of the second one.\n\nso now you have 2 photons that are traveling through the crystal, and each one can cause the same thing to happen - 2 become 4, 4 become 8, 8 become 16, and so on.\n\nok, so what about the mirrors?  well, if the original photon is emitted so that it is traveling PERFECTLY perpendicular to the mirrors, it will bounce back and forth between them over and over.  on the other hand, if it is traveling off at some angle it will hit one of the side walls and simply be absorbed.  now, the odds that the original atom emits its photon exactly along that perpendicular line are pretty low, but sooner or later one will.\n\nanyhoo that photon will start bouncing back and forth between the 2 mirrors, and then the stimulated emission will start to multiply the number of photons - 2, 4, 8, 16, 32, 64, and so on.  after
87432
Its like getting your blood removed... Plasma=whole blood - blood cells. Plasma gives volume to blood, makes it fluid and allows blood cells to circulate (among other numerous functions). Loss of body liquids thickens blood by lowering the volume of plasma (which consists primarily of water), and thats how people die from dehydration... or vampire bites ;)
662319
You may want to reword the question. Plasma is a constituent of blood. \nFake blood (the red blood cell part) can be made using porphyrin chemistry.
574031
There are two confinement methods to confine high temperature plasma. One way is by applying magnetic fields so that the plasma particles are forced to follow a helical path around the field lines.To increase the confinement the device is usually made in a toroidal shape so that the particle remain attached to the same field line for a lnger time thus increasing the confinement. This method is known as Magnetic confinement and is frquently used in fusion devices and other plasma devices.\n     Another less frequently used method is Inertial confinement fusion where intense lasers are used to confine the plasma by employing the radiation pressure of the laser radiation.\n\nThough in both the methods there are few unresolved issues like instabilities, anomalous transport etc. Research is going on to find a solution of the problems.
1040813
Plasmas:\nPlasmas are a lot like gases, but the atoms are different because they are made up of free electrons and ions of the element. You don't find plasmas too often when you walk around. They aren't things that happen regularly on Earth. If you have ever heard of the Northern Lights or ball lightning, you might know that those are types of plasmas. It takes a very special environment to keep plasmas going. They are different and unique from the other states of matter.\n\nBose-Einstein condensates:\nThis state of matter was the only one created while you were alive. In 1995, two scientists, Cornell and Weiman, finally created this new state of matter. Two other scientists, Satyendra Bose and Albert Einstein, had predicted it in the 1920. They didn't have the equipment and facilities to make it happen in the 20s. Now we do. If plasmas are super hot and super excited atoms, the atoms in a Bose-Einstein condensate (BEC) are total opposites. They are super-unexcited and super-cold atoms.\n\nHope these will help. :D
1056339
There are a few items you will need:-\n1) A source of high voltage (to exicte the gas in your laser to emit photons). A readily availible item to do this would be the ballast (transformer) in a flourescent tube. This should get you up to between 700 to 1700 volts. It is preferabe if you have a supply closer to the upper end. This is dangerous so be sure to use appropriate precautions when working with high voltages.\n2) Choose the type of gas to excite. Gases to use include Carbon dioxide, helium, argon, neon, krypton - depending on the frequency you want from the laser. A nice big ruby could be used to make a really cool ruby laser - I could never afford to buy one though.\n3) build a laser tube - or better buy one from ebay. If you have glass blowing skills and make can make your own electrodes and embed them in the glass tube and make partial reflective mirrors on the end or the tube you can make one - but it's really tricky.\n4) fill your lser tube with the gas/gases you choose under reduced pressure.\n5) connect the electrodes to your power supply\n6) power it up....\nIt's as easy as that... uses the same basic principle to a flourescent tube, except that all the light from the partial reflector window is in phase.\n\nFor more detail I suggest you google something like "home made laser"