Laser is light energy used to stimulate healing, provide pain relief, and facilitate the reorganization of injured tissues. Although the therapeutic window is 600-1000nm, the actual wavelength will vary depending on which unit one is working with.  Some of the well known biological effects of laser are cartilage stimulation, fibroblast production, enhancement of immune cells to combat pathogens, and increasing the vascularity of the healing tissue.  Indications for use of laser include but are not limited to wound healing, tendonitis, bursitis, fasciitis, capsulitis, tendon/ligament injuries, muscle spasm/trigger points, arthritic disorders, and stimulation of acupuncture points.