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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 reaction between a shield and laser is completely random
Is this mentioned in the book? I can't recall.
It is, in the opening as well as (more briefly) when Duncan leaves his shield in the desert as a booby trap for the Harkonnen search parties.
Hmm, I've taken a look and can only find references to the location being random so far. I was quite sure that I've also read that the magnitude could vary, but maybe I misremembered. I'll dig a little further and see if I can find a reference.
As far as I know it is random in the sense that the shield-lasgun interaction can either annihilate the target, the laser operator or just culminate in a giant nuclear-like explosion. Therefore you don't know whether your move will have the intended effect or whether it obliterates only yourself while the enemy is fine. I think this is mentioned early on in the first book.
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?
My understanding is that such a technique is known, but the first person to do it is going to get dog piled by the other houses. MAD
Given the basic premise from the very beginning, where the emperor wants to destroy house atreides, I doubt it. If the houses were going to honor their promises, they already should have
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.
I'm pretty sure the answer is that building a lasgun and a shield is more expensive than building a nuke.
Like, the reason they don't use nukes in Dune isn't because they don't know how to make them, it's because if you ever use them you'll immediately unite the entire Landsraad against you. They have very strict rules against it. And creating a pseudo-nuke as you described still falls under the convention. So, sure, you can do it, but it's wasteful and pointless. Only reason to do it is if a lasgun and a shield is all you've got handy, and you're willing to become public enemy number one for the galaxy.
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.
They did answer the question. Anyone who tries it without some SERIOUS protection would be utterly annihilated once word got around they intentionally induced nuclear detonations. Using nukes of any kind is a major taboo in universe, everyone is able to do it but when you break the taboo nothing is stopping your enemy from repaying in kind.
You can just people do neither
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 :)
The Landsraad has a sort of Mutually Assured Destruction pact. Any house that uses atomic weapons against another house would be immediately destroyed by all other houses. Paul uses atomics to breach the Shield Wall technically against a feature of the planet, not house Harkonnen, so there's still political subtlety there.
Lasgun-shield interaction is indistinguishable from atomic weapons.
So deployment of this kind of weapon will ensure your own annihilation.
From memory, the lasgun-shield explosion is unpredictable and proportional to the size of the shield. So, a personal shield could produce a relatively small explosion, a house shield would produce a cataclysmic explosion.
Also sometimes the explosion would be on the side of the laser, not the shield. So you could shoot one down from space and end up blowing your ship up and not having anything bad happen to the shield side on the planet
Yes, the energy of the explosion is a function of the total energy between the output of the laser and the shield, specifically the shield energy being pointed at the laser origin. That's why they randomly hid some maximum powered, monodirectional shields facing up when they fled the attack. So that even the relatively weak personal shields would still have a large impact. In general use, the shield energy is being projected in all directions, so the amount facing the laser origin is very small. IIRC, an average powered lasgun hitting a personal shield creates an explosion that can range between roughly an HE hand grenade and an HE naval shell. They only went up like nukes because the Harkonen were using the lasguns at max energy, and the shields were tweaked abnormally. And as another comment says, the actual point of the explosion is at a random point along the beam.
Also, afaik, the reaction isn't consistent or predictable - its more of a risk thing, which doesn't make for a great weapon.
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.
Right? Magic is real in Dune, we don't don't need a hard sci fi reason for every missing technology frank Herbert didn't think of in 1965.
For the fun of hard sci fi is theorizing the stupidly powerful shit. Playing with the in universe science.
In any case they wouldn’t even need to have parachutes, just fire the laser a moment before impact or build some kind of drone that had multiple lasers that fired simultaneously…. Big, big booms.
Nukes play a rather pivotal role in Herbert's book though. He definitely thought of them.
I am talking about OP's idea of using lasers instead Nukes, nukes are fine, they fit the theme of 50s/60s geopolitical allegories rather perfectly. Using hard sci fi logic on a space opera sounds like an exercise in insanity, but OP is free to drive themself mad however they like. It's Lemmy, we're all mad in one way or another.
Is Dune a space opera? It's more sci-fi than something like star wars for sure
Very yes. Interstellar adventures starring a young man who leaves his ordinary life to pursue his magical destiny to bring down the empire- it's not all that different from star wars either.
Simply nuking the shit out of everything wouldn’t really make for an interesting story.
It did for the Killing Star. Not nukes, but R-bombs which are probably the most insane WMD-s and unlike strangelet bombs actually feasible even at our current tech level. All you need is a light-sail and a big-ass solar-powered laser.
But, yeah, for dune:
Also remember - no computers and that all space access is through the spacing guild or whatever it's called.
So control/timing is difficult and you would have to persuade (bribe) the spacing guild to support you. (Or have someone suicidal enough to do it manually. Could be set up manually with a timer I guess?
Bashar Miles Teg entered the chat ...
The fastest man alive!
Look at him gooooooo
Here he comes... andtherehegoeeees...! Oops, I think someone just slit me across the throat.
I don’t think you can assume that would be easier than building a nuke
Shields and lasguns were available to a significant number of fighters. If you were able to accurately hit a shield with a lasgun, you were probably within the blast radius too.
Miles Tek does that in the later books, IIRC. strap a lasgun to a shield generator, instant pseudo nuclear bomb.
Edit: I guess the difference is that they are dropping the whole package, not just the lasgun.
I have a much better question, why not build a spice harvester that has a carryall attach to the top of it permanently?
Because one carryall can service multiple harvesters, thus reducing operating and equipment costs.
Yeah but how many spice harvesters are they losing and how much do they cost
Irrelevant to the Harkonnen as long as they meet their quotas.