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Laser tattoo removal is a successful application of the theory of selective photothermolysis (SPTL). [39] However, unlike treatments for blood vessels or hair, the mechanism required to shatter tattoo particles uses the photomechanical effect. In this situation the energy is absorbed by the ink particles in a very short time, typically nanoseconds.
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of ... minimum cost; Research on improving these ...
[2] [3] The technique originated as an alternative method of covering up unwanted tattoos, instead of the more expensive tattoo removal. [ 4 ] [ 5 ] However, blackout tattoos became increasingly popular as an aesthetic choice in South Asia during the 2010s, [ 6 ] a practice which largely derived from local tattooing techniques such as Bornean ...
The Nd:YAG laser is the most common laser used in laser designators and laser rangefinders. During the Iran–Iraq War, Iranian soldiers suffered more than 4000 cases of laser eye injury, caused by a variety of Iraqi sources including tank rangefinders. The 1064 nm wavelength of Nd:YAG is thought to be particularly dangerous, as it is invisible ...
The Gaussian function has a 1/e 2 diameter (2w as used in the text) about 1.7 times the FWHM.. At a position z along the beam (measured from the focus), the spot size parameter w is given by a hyperbolic relation: [1] = + (), where [1] = is called the Rayleigh range as further discussed below, and is the refractive index of the medium.
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