You may not know this, but green lasers are actually 2 stage infrared lasers that have the frequency doubled (and the wavelength halved) into the green part of the spectrum.
They are only about 6% efficient, whereas red and blue lasers are “pure” lasers.
[Via Slashdot on Ars Technica:]
“Ever wonder why projector systems and televisions doesn’t use laser illumination? It isn’t for safety reasons, and it isn’t for efficiency reasons—laser diodes have efficiencies ranging from 30 to 50 percent. No, the problem is green light. We have red laser diodes, and blue laser diodes turned up nearly 15 years ago. But green—where the heck is the green laser diode…? ”
Great, so all the laser harpists can now burn holes in their hands even faster!