[throwawayaway12]

There are definitely petawatt class lasers currently (ex. the Texas petawatt). I think most are of order 100 fs.

[jsjohnst]

Per the research I just did, 2PW has been done for one picosecond, 10PW is being built. Apparently because of the very very short pulse, the energy required is trivially small (as in less than a light bulb in your house for an hour)