mechanism
of action
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, is a therapeutic device producing monochromatic (one specific wavelength), coherent (constant phase) and polarized (directional) light.
generation
The source of laser beam in therapeutic lasers is typically a semiconductor diode capable of producing light of one specific wavelength (e.g. 1064nm).
The light generated by the diodes is then directed into an optical fiber, end of which is connected to the applicator. The beam is further processed by a series of lenses which ensure the right direction and diameter of the beam and consequently the spot.
Therapeutic lasers are defined by their power and wavelength. Wavelength is important as the ideal effects on human tissue are of light in the “therapeutic window” (approx. 650 – 1100 nm), which ensures a good ratio between penetration and absorption in the tissue. The amount of power a laser can safely deliver can reduce therapy time by more than a half.
Check the calculatorclasses
Based on power and wavelength lasers are divided into several classes. Therapeutic lasers are typically of class 3B, low level laser therapy (LLLT) with power less than 500 mW, and class 4 lasers with power 500 mW and more, High Intensity
modes
High Intensity Laser can be used in two general modes – pulsed and continuous. Pulsed mode represents turning the laser on and off with very high frequency and is generally used as analgesic treatment. Continuous irradiation is a mode in which the laser remains turned on the whole time of the therapy and is used to promote biostimulation, healing and recovery.
safety
Although High Intensity therapeutic lasers are generally safe to use and promote healing and reparative processes, but they can damage the eye and so protective eye-wear is obligatory throughout the therapy. With increasing power of the High Intensity Lasers caution is in place as to their thermic effects which on one hand provide very pleasant therapy, but on the other, if not monitored and used by a trained operator, can damage the tissue.
