I know that you aren't allowed to have a laser weapon for blinding the enemy, but I also know that lasers are used in all kinds of situations.
204487
Protocol on Blinding Laser Weapons (Protocol IV to the 1980 Convention), 13 October 1995\n\nThe rule is that you cannot use a laser for the sole purpose of causing permanent blindness in an enemy.  Lasers used for other purposes (such as weapons guidance) are allowed even if they may have an incidental effect of causing this type of injury.  (Somebody who is about to get hit by a 500 pound bomb will not be blind for very long.)
532104
they use laser to cute it  to be more accurate
152558
If you could find a transition between an inverted state and a ground state of 1 joule, you could probably make a laser of that frequency. At this point, hard gamma rays are the limit we have done.
51281
A laser light as you described is not going to cause eye damage by looking at it as most are lead to believe. That is also true about having a laser pointer being pointed into one's eye. You eyes will become injured more so if you look at the sun.\n\nIf you have nothing better to do but to look at the bottom of your mouse, then you have other problems... ;=)
387806
You don't define "harmful".  Infrared (IR) is electromagnetic radiation (spectrum) just a little bit redder than red light, so to speak.  The old sayings "all things in moderation"  and "the dose makes the poison" are true here as with most things.  We will absorb much of the IR spectrum, so it can be harmful in large amounts.  This would be known as getting a burn, because IR can be simply thought of as "heat" energy.  IR lasers can be made to kill.  Some chemical reactions are controlled by specific IR frequencies, but this is not common.  In general I would say that the most important safety factor is the intensity or the energy of the radiation beam.  can IR be harmful? yes, all electromagnetic radiation can be harmful, just like all chemicals can be.  In case you missed it, that leaves nothing that is NOT potentially "harmful".  But what would we watch without all those bright lights?  I've got one for you:  Is water harmful?  Yes or No?\nAnyway, since IR is lower energy per photon than red light (or yellow, green or blue), I'd venture to say that it is less "harmful" than light. Q: Which is the most harmful type of bullet?  A:\nThe one that hits you!
57241
No, one of the defining properties of a photon is that two or more are capable of simulatenously existing at the same co-ordinates. As such they can't possibly intercept each other or cause refraction since that requires either that they bounce of one another or else slow one another down. Neither is possible if they are to continue being capable of coexiting at the same location.\n\nPhotons can certainly interfere with each other, but only to the extent of increasing or decreasing amplitude, not wavelength or direction. At best you could theoretically reduce the amplitude of one source to zero, thus making it cease to exist, or alternatively boost the amplitude for a stronger signal.
523551
i want to make a system that gets mounter to the passenger front bumber of my car, so when im stuck in traffic and some _hole feel he deserves to drive in the emergency lane, the laser will burst a hole in his tire, and give him a reason to be in the emergency lane.  Some issues with this system is the timing of when to fire the laser, how much power the laser would be.  You dont want to accidentally fire at the wrong thing, so these issues must be addressed first.  I think thats pretty innovative.\n\nwhilst working on my M.E. senior design project, my sponsor (an artist) wanted to make a dynamic hologram depicting a full COLOR rainbow..  Yeah, I know...  It made for great jokes the entire year.
109265
Absolutely! That's YOUR home that that foreign army is trying to destroy. Running and hiding instead of picking up a rifle and fighting may not save you. If you fight, at least you would have a chance to preserve your way of life, as well as the lives of those who can't fight.
659852
A tazer and a handgun can not be compared. A tazer is another tool in the escalation of force. Verbal commands, physical restraint,  pepper spray or other chemical agents, baton, tazer and eventually a firearm.  A tazer by no means is intended to replace the ability to use deadly force. As a law officer the last thing i want to do is to ever have to use deadly force and the tazer is another tool to assist me in not having to. But there are some dangers of using the tazer especially after the use of chemical agents as some of these are oil based and can flame. The tazer works with high voltage and low amperageto disrupt the nervous system. High amperage is what kills. But just like anything else there are documented cases (although rare where people have died) it is usually in people that are under the influence of narcotis and their heart can not stand the extra strain.
146012
This is either a really stupid or really intelligent question.\nPerhaps he is questioning the try all paths theory of photon behaviour on a quantum level? It is possible, but so unlikely you may as well consider it impossible.\nIn a normal situation, it is impossible for light to randomly appear.\n\nCombustion isn't needed for light either though, if you're asking if light can be created through other means than combustion? A laser doesnt combust....
342357
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.
99061
Light can be both a particle and a wave.
476714
im blind due to a laser pointer my dog is typing this up for me
457152
i think that you should try to make some working models of semi conductors and and their use in the LED as you will search for the led then you will find that how semi. cond. helped to enrich the fields of leds . and i think that either you can go with the working projet of radar and how they used . or on lasers. lasers is really an interestin field. and i don't have any idea bout the chems. go to the discovery kids.com site and you will thousand of project reports.
544472
The most powerful laser in the world right now is at Lawrence Livermore National Lab.  Its power is measured in terawatts and it is used to study nuclear fusion.  \n\nAfter that, the next most powerful types would be the chemical lasers being developed by the military as weapons.  One of these will be used for the Airborne Laser and its power is well into the megawatts (though the exact wattage is classified).  This is a Chemical Oxygen Iodine Laser (COIL).  This and other similar lasers produce laser action by the reaction of two different chemicals.\n\nIn the civilian world, the laser that can generate the most power would be the carbon dioxide laser.  These were also used in the past for possible development into weapons but were soon surpassed in power and ease of operation by the chemical lasers.  Powers were well into megawatts, especially for the gas dynamic CO2 laser, which functioned more like a rocket engine than a typical gas laser. \n\n " The largest known laser for industrial use produces 120 kW continuous (for up to 1 hour at a time) - it's located at the San Francisco Naval Shipyard and is used for welding aircraft carrier hulls. It's capable of doing a full-penetration weld 12" deep at 100 IPM. This laser is also huge - about the size of a 3 bedroom house." (http://www.repairfaq.org/sam/laserco2.htm#co2ccy)\n\nAfter that you have solid-state lasers, which are gaining in power and (at least for use as weapons) are expected to one day be nearly as powerful as today's chemical lasers.  These are usually ND:YAG or ND:Glass lasers.\n\nAs for protection, technically you should have eye protection while using any laser over 5 milliwatts - that's the garden variety laser pointer.  Anything more powerful than that is capable of causing blindness, in some cases instantly.  Once you get into class 4 lasers (anything over a half a watt) you'll need skin as well as eye protection.
561081
There is a little research and some guy even wrote a book claiming that teleportation is feasible.  But don't buy your home teleportation machine yet.  As yet the only thing that has been transported is a few laser beams.
229479
Well I think that the tazer, or even the billyclub, let alone the gun can (and are in soem cases) misused by the Police. There are settings on the tazer that measure the "force" used as far as I know. And I am sure we have all heard about the misuse of force and police once or twice. Indeed I do think a flashlight or handcuff can be considered cruel and inhuman if used incorrectly. I understand your concern, but unfortunately I think it is the human capacity to err that is truely in question. :)\n\nHave a good day hun.