TOP 5 · What colour of laser is the most powerful?
Purple: 380-450 nanometres
Energy per photon: 3.3 MeV. The energy of a light particle (photon) intensifies with its wavelength. The shortest wavelengths that the human eye can identify is about 390 nanometres (nm), corresponding to a purple colour. BLUE 450-495 nm 2.8 MeV Although blue laser includes less energy per photon than purple, it is more hazardous to eyes. The eyes absorb more light with increasing wavelengths. GREEN 495-570 nm 2.5 MeV Green laser is the most harmful. Our vision is better at perceiving green hues than other colours, as the eyes absorb more light at such wavelengths. YELLOW-ORANGE 570-620 nm 2.2 MeV RED 620-750 nm 2 MeV Eye surgeons use yellow lasers to stop bleeding in the retina at the back of the eye. 577 nm light is absorbed by the blood, boosting coagulation. The safest laser colour is red. At 700+ nm, the eyes cannot detect the light, which is known as infrared and can only be seen with a thermal camera.