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a photofacial or fotofacial is a 30 minute procedure in which intense pulses of light are used to penetrate deep into the skin ipl photorejuvenation then causes collagen and blood vessels below the epidermis to constrict reducing redness and age lines
Photodiode. a semiconductor diode characterized by unidirectional photoconductivity when exposed to optical radiation. A photodiode is a semiconductor crystal that usually has p-n junction with two metal terminalsâone from the p-region and the other from the n-regionâand is enclosed in a metal or plastic housing.Photodiodes are made of such materials as Ge, Si, GaAs, or HgCdTe.hen operating in the first mode, a photodiode is used as a photoconductive cell to control the electric current in a circuit in accordance with the variation in the intensity of the incident radiation.