The anti-laser has been invented.
Light is absorbed by pretty much everything – all the things around you reflect and absorb different wavelengths of light leading to all the colour we see around us.
But lasers have just one wavelength – so designing to absorb lasers completely is hard.
But do not rely on this to protect you from Storm Trooper attack. Since Conservation of Energy must be followed – the thing gets hot…
The energy gets dissipated as heat. So if someone sets a laser on you with enough power to fry you, the anti-laser won’t stop you from frying
Professor Stone, Yale University.