In the Dune universe, when a laser weapons hits a shield, both are destroyed in a nuclear explosion reaction.
So instead of building nuclear weapons, wouldn’t it be easier to tie a timer and a “parachute” to a laser gun and drop it from orbit onto your enemy’s city?
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The reaction between a shield and laser is completely random, not knowing wether you are going to vaporise a few molecules, an entire city or everything in between makes it very unreliable for warfare purposes.
And you’d probably find the whole Landsraad against you, as using atomics is outlawed. While a bomb like that isn’t an atomic weapon by definition, the effects are the same and it stands to reason that they’ll therefore still retaliate in full force.
The whole lasgun-shield interaction concept is one of the hand-wavy parts of Dune, kind of like the eagles in LOTR, or the ridiculously inaccurate laser blasters in Star Wars.
Shields in Dune are common defensive technology, which means that lasguns would almost certainly have to be outlawed altogether to prevent some random encounter from turning into nuclear apocalypse.
In the first movie, I think Villeneuve deals with it somewhat haphazardly. The use of a lasgun at the agricultural research station perhaps makes some sense because shields can’t be used in the open desert without attracting worms. On the other hand, they show lasers being used at the first Battle of Arrakeen in close proximity to other ships that are shown to have active shields.
I remember that the location of the reaction is random and happens anywhere along the beam path. So they are safer to use at long range like from orbit as the reaction is less likely to be close to the shooter.
Yeah I always just figured the nuclear reaction would happen on the “outside” of the shield sending it in a less directional method. The shield would still fail but kinda ricochet it?
I actually just came across the line that explained this in the first book. apparently, after the fact, there’s no way to tell the difference between this and the use of an atomic, so using this strategy could get your family accused of illegally using atomics against another house.
It’s sort of like the nuclear weapons situation in our world. Everyone who has the weapon know they can use it, but they won’t, unless there’s somone crazy enough cough Muadib cough to do it, because it all but assures complete destruction of your house by the rest of the great houses. It’s an unspoken rule.
That’s not their question though. Their question is about why build nukes when you can achieve the same effect with a shield and a lasgun.
IIRC, this is actually done at some point in the books.
Fremen setup some shields in the desert to punish the Harkonen for randomly firing lasers at the sand trying to smoke them out. Or something like that.
spoiler
You do remember correctly. Bashar Miles Teg at one point utilizes a variant of that technique. They mount pairs of shields and lasguns on anti-g platforms and use them as surprise tactical nukes in a battle against the Honored Matres. That is one of the many epic af moments in the Dune saga. I think I will have to read it for the umpteenth time now :)
Well in addition to the other answers, out of universe, the answer is power of plot. Simply nuking the shit out of everything wouldn’t really make for an interesting story.
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