The navy really, really, really, really, really hates chemical lasers. With a passion. They haven’t touched them for years and years.
The Navy ships treat gasoline like it is plutonium, for example; when small UAVs or outboard motors need it it’s stored with extreme care.
The Navy is rightfully obsessed with fire prevention (the true ship killer) and avoiding toxic chemicals as much as possible. Imagine the USS Cole if it was storing tons of the toxic soup needed for a chemical laser.
They are only looking at solid-state lasers, and at the high end, the Free Electron laser (which requires a 100 foot particle accelerator, but at least no toxic chemicals.)
Well, a 400 ft. ship dedicated solely to lasers and fire control would have plenty of room for particle accelerators. Maybe it is time for the navy to resurrect the Anti-Aircraft Cruiser. Too bad there is already sub named Atlanta.