QUOTE (Lionhearted @ Feb 9 2008, 02:49 PM)
the notions of laser weapons is rather silly to me, plasma rifles i can buy.. but using fraggin light beams?
the best industrial lasers today can 'cut' (actually it melts the metal) 25cm of armored steel, after that it simply cannot get hot enough, mind this is when the beams origin is like 2cm from the metal it self. even if it worked it would be more like a long range blowtorch than a starwars pew pew lasergun, Highly concentrated plasma slugs is the future!
"Plasma" weapons are stupid. Gases expand. Superheated gasses expand very quickly. You'll end up with a huge gun that requires a giant battery pack and has a range of less than a foot.
Lasers are the best weapon in a long-distance aircraft/cruise missile war. Their speed means that they can be used to reliably intercept missile in a way that other missiles and projectiles cannot. Weapon lasers aren't industrial lasers. They are substantially more powerful. A laser's destructive potential is totally dependent on the amount of energy put into it. With sufficient energy output a laser can heat steel fast enough to cause it to explode into a cloud of vapor (who needs to melt steel when you can boil it). The most powerful laser in the world, located at a Lawrence Livermore Laboratory, has a
1.5 1.25 petawatt (
1,500,000,000,000,000 1,250,000,000,000,000 joules per second) output. Needless to say, the destructive potential of a quintillion watt beam of light is insurmountable. To put it in perspective, those industrial cutting lasers have a 3000 watt output. Certainly, a weapon that is
five-four-hundred-billion times as powerful will be able to do a bit more damage.
Of course, the absurdly powerful laser at Lawrence Livermore is also absurdly huge and can only be fired for a very short time. But, that is only an extreme example. Modern anti-missile lasers are still substantially more powerful than their industrial equivalents, with many megawatts of output compared to only 3 kilowatts at the most. The real problem is ammunition. The THEL uses a reaction between deuterium gas and fluorine free radicals to produce the laser light. This requires a very large amount of both chemicals which are used up fairly quickly. The result is an ammunition mass which makes it more practical for mounting in modified cargo jets or permanent ground installations.
In Shadowrun, lasers appear to be primarily electrically powered, which makes sense. The most primitive laser is basically a light bulb with a focusing lens (one can use the sun to set things on fire with a good lens). All one would need to do to make a man-portable kilowatt laser is to make a LED that is strong enough to take in and output a thousand watts, a lens to focus it, a power source with a kilowatt output.
Also lasers can go phew phew. It is a rather simply thing to pulse them rather than use a continuous beam. On off on off on off on off/
The real problem with lasers is attenuation, scatter, and divergence. The former two only occur in an atmosphere and can be mitigated by using certain wavelength where are not prone to scatter or attenuation. The last is a problem is space as well and can be mitigated by focusing the beam more tightly, but only to a point; it does provide an upper limit to effective laser range without increasing power output.
Edited to correct some numbers