Abstract

In this Letter, we demonstrate for the first time, to the best of our knowledge, ${{\rm NiCo}_2}{{\rm O}_4}$ (NCO) as a novel nonlinear optical material with straightforward potential applications in optical limiting. For the 532 nm nanosecond laser, excited state absorption (ESA) and free-carrier absorption give rise to large ESA coefficient (${\beta _{{\rm ESA}}}$) and positive nonlinear ${{n}_2}$. On the other hand, when excited with the 800 nm femtosecond laser, two-photon absorption (TPA) takes place, and bound carriers induce strong negative ${{n}_2}$. The values of $\beta$ and ${{ n}_2}$ obtained for NCO are found to be higher compared to other conventional transition metal oxides and, therefore, are promising for optics and other photonics applications.

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the corresponding author upon reasonable request.

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