LED is the use of carriers injected into the active region of spontaneous radiation composite luminescence.
To generate laser light to meet the following conditions:
One, the number of particles reversed;
Two, there should be a resonant cavity, can play the role of optical feedback, the formation of laser oscillation; the formation of a variety of forms, the simplest is the Fabry - Paro resonant cavity.
Three, the generation of laser light must also meet the threshold conditions, that is, the gain should be greater than the total loss.
Laser and ordinary light, sunlight is different, it has a good direction, pure color, energy and other physical characteristics. In the clinical application of laser medicine, there is a distinction between strong and weak lasers. Laser irradiation of biological tissues, if directly caused by the irreversible damage to the biological tissues, the irradiated surface of the laser is called a strong laser; if it does not directly cause irreversible damage, called a weak laser.
LED light source is a new type of light source in the family of lasers, belonging to the category of "weak lasers", which is considered to be one of the most ideal medical light sources in the future of mankind.
LED light source itself does not contain harmful substances such as mercury, lead, infrared and ultraviolet pollution, and will not be in use in the outside world of the pollution.
LED is a light-emitting diode (LED), which is a solid-state semiconductor device that converts electrical energy into visible light.