Optical crystals with a strong nonlinear response to light are important tools in photonics, enabling applications ranging from wavelength conversion to short-pulse generation. Neil Savage surveys some of the materials on offer and their uses.
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Savage, N. Nonlinear crystals. Nature Photon 2, 380–381 (2008). https://doi.org/10.1038/nphoton.2008.97
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DOI: https://doi.org/10.1038/nphoton.2008.97
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