At 1032 nm, diamond's nonlinear refractive index is positive and four-fold anisotropic, and its magnitude decreases with rising NV center concentration, consistent with a negative two-level NV contribution.
Nitrogen related paramagnetic defects: Decoherence source of ensemble of NV- center,
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Impact of Nitrogen-Vacancy Color Centers on the Optical Kerr Effect in Diamond: A Femtosecond Z-Scan Study
At 1032 nm, diamond's nonlinear refractive index is positive and four-fold anisotropic, and its magnitude decreases with rising NV center concentration, consistent with a negative two-level NV contribution.