In 1960, after Theodore Maiman invented the ruby laser, a new demand for flashtubes began for use in lasers, and new interest was taken in the study of the lamps.
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He then switched from theoretical physics to experimental physics in graduate studies at MIT under the supervision of Charles Hard Townes, shortly after the experimental realization of the ruby laser.
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The laser hair removal technique was discovered as a side effect of tattoo removal, in which a ruby laser not only removed the tattoo but killed the hair around it.
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In one study of 13 people, Anderson found that a ruby laser made by Spectrum Medical Technologies in Natick, Mass . produces a delay in hair regrowth of about six months.
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Due to its limits in output power, tunability, and complications in operating and cooling the units, the continuous ruby laser was quickly replaced with more versatile Nd : YAG, and argon lasers.
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In the early 1980s, a new clinical study began in Canniesburn Hospital's Burns and Plastic Surgery Unit, in Glasgow, Scotland, into the effects of Q-switched ruby laser energy on blue / black tattoos.
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On May 16, 1960, at Hughes'Malibu, California, labs, Maiman's solid-state pink ruby laser emitted mankind's first coherent light with rays and published other scholarly articles describing the science and technology underlying his laser.
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Note the two broad blue and green absorption bands and the narrow absorption band at 694 nm, which is the wavelength of the ruby laser . Ruby also absorbs some of the light at its lasing wavelength.
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Q-switching was first proposed in 1958 by Gordon Gould, and independently discovered and demonstrated in 1961 or 1962 by R . W . Hellwarth and F . J . McClung using electrically switched Kerr cell shutters in a ruby laser.
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A pulse with duration of 25 nanoseconds and 0.5 4.2 joules of energy from a Q-switched ruby laser can initiate detonation of a PETN surface coated with a 100 nm thick aluminium layer in less than half of a microsecond.
