An application that came to mind is tunneling (through rock and earth). You could absolutely tune the wavelength to whatever material your drilling through absorbs best, to help ease and speed. Would need a good amount of energy but I could see that utilized in some fashion in the next 10-20 years
I think that if you can hit the right frequency, the resonant frequency for wiggling the water molecule or whatever, it can cost less energy.
So like if you can get just the right frequency you could cause a skin protein molecule to fall apart, which might be nicer than scalpels.
Maybe you could weld it too. A "protoplaser" like in startrek.
I remember seeing a yt video about this tech being already trialed (w/ regular lasers) for geothermal. They use lasers to "vaporise" rock, in the hopes of digging much more efficiently.