Laser For Ionizing Water?

Surely just as much, if not more, power than conventional electrolysis.

If there was a laser that could generate a specific wavelength that exactly matched the energy of the hydrogen-oxygen bond (i.e., where λ = h*c/E, E being the bond energy) then it might be possible for a laser to be more efficient than other methods (thermal, electrical) for electrolysis. A quickie calculation indicates that this wavelength is probably in the gamma-radiation wavelength range.

A little common sense also comes in to play: If 'light' was able to break the oxygen-hydrogen bond, then sunlight would have prevented the oceans from forming.

I am only need to ionize the water to make it more conductive, not to actually perform the splitting process.