why do lasers have colors and how can they have colors?
the title basically says it all but the point is what change when they have color? does this make them more powerful?
and one of my friends told me that green lasers were more powerful than other colored lasers. is this true?
and what is the component that makes it have a certain wavelenght, so a certain color?
I want to thank you all for your answers and you have all helped me a lot understanding lots of things about laser.
Once again, thanks everyone :)