Torpdeos, stealth missiles and manouvering tragets
@ Magazine Unlimited >>> Seriously
The USN has been looking at anti-torpedo defences for a while. Currently, as well as towed decoys and their own torpedos programmed for the anti-torpedo role, they are looking at active sonar wave weapons powerful enough to actually break up a torpedo. The latter is unlikely to be popular with the whale-huggers. The big problem for a torpedo is range - any sub wanting to take a crack at a US battlegroup will have to get well within range of not only the carrier's airgroup, but also the extensive underwater sensors used by the ships themselves. In any confrontation where the USN is likely to meet such a threat, it is also likely they will use their own hunter-killer subs to sweep ahead of the fleet. The Soviets spent a lot of time during the Cold War testing the NATO anti-sub defences and the USN has a lot of practical experience in countering subs. An air-launched torpedo also means getting your launch aircraft within the fighter screen and past the same laser air-defence turrets, so again unlikely.
RE: Sod torpedos...
Nice idea, but stealthy missiles are only as stealthy as the launch vehicle, and all current missiles leave a very obvious IR trail that can even be spotted head-on, let alone from above. Any launch vehicle has to first get to a launch point and detect the target - the USN battlegroups have lots of fighters to make sure that doesn't happen, and lots of EW and ECM kit to make the task all the harder.
Re: DIVE! DIVE!
Whilst mach2 and 5g+ manouvering make the targetting harder, they don't make it anywhere near impossible. The old Phalanx or Goalkeeper kit will cope quite happilly with targets doing such manouveres, and they're both '80s designs. The mach2 and 5g+ manouvering was designed to avoid systems like Sea Wolf, which go for a head-on collision using a prediction of the attacking missile's flightpath. With lasers, since the lead is minimal, manouvering just gives the laser more time to engage you. A much better approach would just be a swarm attack using the fastest possible missiles.
The swarm attack would probably defeat a ship with one or two turrets, but the 80 MW engines of the likes on the Zumwalt class imply a future ship could have dozens of turrets. If Boeing can get a through-deck turret of around the size of the existing 4.5in/5in types used on the current fleet then we might see the return of all-gun destroyers with four or more turrets, and larger ships along the lines of the old WW2 Dido class air-def cruisers with five-plus turrets. Not so sure about anything bigger - even the USN may bulk at the expense of building something of the Iowa class size, but if they did it could mount a dozen-plus such turrets and still have room for many missile launchers. Of course, Iowa and Wisconsin have been mothballed, not fully-decomissioned, so the USN could actually make the step up to laser dreadnought much faster than such "sensible" nations as Britain, where the RN had all their capital ships broken up long ago by civil servant "experts" that said we'd never need such large ships again.....