What is therapeutic laser?
Therapeutic laser is the application of light energy to areas of the body to stimulate healing. This light–tissue interaction is called photobiomodulation. In the past, therapeutic laser was often referred to as “low-level” or “cold” laser (as opposed to a surgical or “hot” laser).
The word “laser” originated as an acronym for light amplification by stimulated emission of radiation. Laser light is different from “normal” light because it is of a single wavelength and it is focused (concentrated). The wavelength influences the biological effects of the therapeutic laser and is measured in nanometers (nm). The wavelength also determines the depth of penetration into the body’s tissues. Most medical laser applications use light wavelengths ranging from visible red to infrared. The shorter, visible wavelengths penetrate tissue to a shallower depth, whereas longer, infrared wavelengths penetrate deeper into tissue.
How does therapeutic laser work?
Photobiomodulation (the laser–tissue interaction) creates many consequences in the body’s cells, with the most significant being reduction of pain and enhancement of healing. For example, therapeutic laser reduces pain by decreasing inflammation, as well as by decreasing tissue chemicals that stimulate pain and by affecting nerve conduction. Therapeutic laser also enhances healing by increasing microcirculation (blood flow through the smaller blood vessels of the body), stimulating cellular activity, and increasing growth factors.
Therapeutic laser reduces pain and enhances healing.