Raid doesnt even protect against bit rot either. It doesn’t matter how many disks you write to even in a raid one array you are still vulnerable. Unless you have a high end raid card that does block level checksuming your raid array will not go back and verify previously written to data is still correct. If it does have checksuming it still isn’t smart enough to know which drive is the is correct and will lock the array in the best case.

That’s not how light/laser and prisms work. Prisms only separate out the frequencies that are contained within the light/laser. imagine the light is a sandwich and each frequency is a peice of the sandwich. If you take apart the sandwich you still have the same bread, meat and cheese just not stacked together. That’s what the prism is basically doing.