Just to clarify a bit -
It isn't actually a cold therapy, just that the laser is not "hot".
I believe it's called cold laser { also low level laser} because it is not like the surgical hot laser.


[Unlike high-power medical laser, which are widely used to safety cut and remove tissue, the Low Level Laser penetrates the surface of the skin with no heating effect or damage. The energy is directed deep into effected area stimulating the body’s cell which convert the energy into chemical energy to promote natural healing.]
http://www.coldlasers.org/