LASER means Light Amplification from Stimulated Emission of Radiation. Laser is created by specific process within the laser device to cause the controlled emission of radiation in form of light. Laser usually comes in one color and it comes in a thin beam. Lasers were first invented by physicist Gordon Gould in 1958 and first working model was built in 1960.They have been used in Europe and America for more than forty years and have been used in fields of dermatology, surgery. ophthalmology and physical medicine and rehabilitation. Laser is used by physiotherapists for relief of pain, to accelerate healing and decrease inflammation.
An output power of less than 0.5 Watts is classed as Low Level Laser Therapy LLLT ( class III in the USA) whereas lasers with an output powers greater than 500mW or 0.5 Watts are termed High Power Laser Therapy HPLT (Class IV lasers in the USA). HPLT creates heat on the surface of the skin due to their higher power density (irradiance). LLLT is often referred to as “Cold Lasers” since they do not create a heating sensation during treatment.
