Optical parametric oscillation method accurately converts NIR laser light
The design incorporates tiny corrugations into the ring, which collectively act as tiny mirrors, reflecting a particular wavelength of visible light so that it circulates in both directions around the ring. The wavelength of visible light is exactly twice the periodicity of the bumps, which means that designs faithfully produce the desired colour (image: S Kelley/NIST)
The technique has potential applications in precision timekeeping and quantum information science
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