Although lasers are today used by a large variety of professions one of the most meaningful applications of laser technology has been through its use in medicine being faster and less invasive with a high precision lasers have penetrated into most medical disciplines during the last half century including dermatology ophthalmology dentistry otolaryngology gastroenterology urology . Medical lasers are usually operated in a repetitive pulse mode laser pulses are emitted periodically at a pulse repetition rate for example 10 pulses per second hertz hz is the most commonly used unit for pulses per second pulse width pulse duration ns us or ms. Medical applications of diode lasers cover the whole diode laser spectrum starting from 200 nm ultraviolet and violet dls used for sterilization and some surgery applications through photodynamic therapy pdt in the visible wavelength range at 630 690 nm to longer wavelengths
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