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arXiv · 2610.42098

Field-resolved observation and quantification of the instantaneous Kerr response in semiconductors

Haifeng Lin·Hannes Kempf·Hinduja Bhuvanendran·Aitor De Andrés·Markus Ludwig·Nicolò Maccaferri
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Abstract

The optical Kerr effect, whereby the refractive index of a material changes with light intensity, underpins nonlinear photonics and emerging mid-infrared technologies. Accurate determination of the nonlinear refractive index is therefore essential, yet conventional intensity-based techniques infer the nonlinear phase shift indirectly from changes in beam propagation or optical spectra. Moreover, methods such as the $z$-scan cannot resolve the temporal evolution of the nonlinear response, making it difficult to distinguish instantaneous Kerr nonlinearities from delayed contributions, including free-carrier effects. Here, we investigate the nonlinear optical response of germanium at $5 μ\mathrm{m}$ using field-resolved degenerate pump-probe spectroscopy. By measuring the transmitted probe electric field as a function of pump-probe delay, we directly retrieve the pump-induced phase shift and its temporal evolution while retaining sensitivity to changes in absorption. We observe cross-phase modulation that follows the pump intensity envelope and vanishes when the pump and probe no longer overlap, consistent with an instantaneous Kerr response. The phase shift scales linearly with pump intensity, yielding a nonlinear refractive index of $n_2=(0.87\pm0.16)\times10^{-17} \mathrm{m}^2/\mathrm{W}$. Our results establish the instantaneous Kerr effect as the dominant contribution to the measured nonlinear phase shift under our experimental conditions and demonstrate field-resolved pump-probe spectroscopy as a direct, time-resolved method for determining the nonlinear refractive index and distinguishing instantaneous from delayed optical responses.

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Haifeng Lin, Hannes Kempf, Hinduja Bhuvanendran, Aitor De Andrés, Markus Ludwig, Nicolò Maccaferri. 2026-10-30. Field-resolved observation and quantification of the instantaneous Kerr response in semiconductors. https://arxiv.org/abs/2610.42098

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