Are Laser Guns and Lightsabers Practical Weapons or Just Sci-Fi Fantasy?

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Discussion Overview

The discussion revolves around the practicality and feasibility of laser guns and lightsabers as weapons, exploring both their scientific basis and their portrayal in science fiction. Participants examine the nature of lasers, their colors, and the mechanics of lightsabers, questioning their real-world applicability versus their fictional representations.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question why laser guns are depicted with colors, suggesting that lasers are monochromatic and typically not visible unless in specific conditions.
  • There is a discussion about the effectiveness of different laser colors, with some suggesting that higher energy photons, such as blue or violet, would be more effective than red.
  • Participants express curiosity about the mechanics of lightsabers, particularly how they can stop and whether their length can be controlled.
  • One participant humorously suggests that if confronted by a lightsaber, they would prefer to use a gun instead, highlighting a practical approach to a fictional scenario.
  • Technical explanations are provided regarding the nature of laser beams and how they can be focused, with some noting that lasers can be invisible depending on their wavelength.
  • There is mention of fictional elements, such as the power supply for lightsabers, which adds to the speculative nature of the discussion.

Areas of Agreement / Disagreement

The discussion contains multiple competing views and remains unresolved regarding the practicality of laser weapons and the mechanics of lightsabers. Participants express differing opinions on the scientific principles involved and the fictional aspects of these weapons.

Contextual Notes

Participants acknowledge limitations in their understanding of laser technology and the fictional elements of lightsabers, with some assumptions about visibility and effectiveness remaining unexamined.

AnthreX
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i have been wondering...
the guns there r like red laser guns
1.if u want to kill the person why did u have to put the colour to it ?

i thought lasers don't have a colour

and the lightsabre that's just weird..
2.how can a laser stop ??

3.is it even possible to control its length ?
4.and again there is colour is there a colour so we can see ?
 
Science news on Phys.org
IT'S A MOVIE
 
Lasers emit radiation which is essentially monochromatic, ranging over a fairly wide range of frequencies from infrared to ultraviolet. There are lasers which emit radiation sufficiently intense to burn through metal plates.
 
The force is not strong in u anthrex. :/
 
AnthreX said:
i have been wondering...
the guns there r like red laser guns
1.if u want to kill the person why did u have to put the colour to it ?

No color is necessary, but there's no reason it couldn't be colored. High energy photons are probably more effective, so blue or violet would be the more powerful colors. Ultraviolet of x-ray lasers are even more powerful, and those colors are invisible to the human eye.

i thought lasers don't have a colour

Sure they do, though infrared lasers and x-ray lasers don't have color that you can see. But you shouldn't be looking into laser beams anyway.

and the lightsabre that's just weird..
2.how can a laser stop ??
3.is it even possible to control its length ?

I always preferred phasers myself.

As for how can a light sabre be of a certain length, it's done by superimposing laser pulse trains so they destructively interfere past the end of the sword. The control circuitry is a closely guarded secret of the Aldebaron Amalgomated Corporation, as is the ultracompact power supply. Now that's the real trick, since they can't use dilithium crystals (which only exist in a galaxy a far trek away from the Star Wars worlds).
 
Lasers are so highly focused that no photons are lost to the periphery, so unless the laser is shot into your eye, or there is some dispering force (such as fog) in the path of the beam, you shouldn't be able to see it.
 
I have another thought why would you even need a light sabre if darth vader confronted me with a light sabre id pull out my gun and shoot a bright red beam through his hanibal lecter helmet
 

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