Writing for APS Physics, David Lindley looks back at landmark - TopicsExpress

Writing for APS Physics, David Lindley looks back at landmark paper that appeared in 1961 in Physical Review Letters: Just a year after the invention of the laser in 1960, a team of physicists reported a simple experiment that doubled the frequency of laser light, creating ultraviolet radiation from red. This was the first demonstration of a nonlinear optical phenomenon—one in which the intensity of the light leads to effects beyond those explained by standard electromagnetic theory. Today nonlinear optics are used to generate x-ray laser radiation, boost power in optical data transmission, and produce high-intensity pulses for surgery.

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