Laser is more than a word

Laser is more than a device that emits light it’s an acronym for how it is achieved; Light Amplification by the Stimulated Emission of Radiation. Lasers emit mostly Coherent light which means light of one particular wavelength conversely light bulbs and our own Sun are not coherent light sources. Lasers also emit light in the visible spectrum from 400nm (nanometers) to 800nm as well as in the invisible from Ultraviolet below 400nm to Infrared above 800nm. Lasers that emit the three primary colors Red, Blue and Green are called “White lasers” and although each laser is coherent the combined output is not.

Green lasers are the easiest to see because our eyesight is most sensitive to those wavelengths. Everyone see the other frequencies of the the visible spectrum differently but green is the one color that most people see clearly. Some people see our yellow sun as different colors but some of that is due to the angle we are viewing the sun.

The sun is considered yellow because of it’s temperature it’s not because it looks yellow.