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| Conventional microresonators (top) are limited in the wavelengths they can produce through OPO. By partially etching away the silicon dioxide film under the microresonator to create an “undercut” and using a thicker layer of silicon nitride (bottom), NIST researchers were able to cover the entire “green gap” spectral range while also improving the density of the generated wavelengths. Credit: S. Kelley/NIST. |
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