I haven’t read the book in 20 years, maybe there weren’t any on Arrakis. But people for sure used them; this Dune wiki says:

However, shields for ships and planetary installations could and often did have extremely low penetration velocities, as artificial life support technologies could be utilized while the shield was active.

So shielded installations must have existed.

It also says that Duncan Idaho sometimes used the threat of the laser-shield interaction to intimidate his enemies; I don’t remember that, it must have been in a book I didn’t get to.