Non-instantaneous third-order optical response of gases in low-frequency fields

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Date
2022
Volume
30
Issue
13
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Publisher
Washington, DC : Soc.
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Abstract

It is commonly assumed that for low-intensity short optical pulses far from resonance, the third-order optical nonlinear response is instantaneous. We solve the three-dimensional time-dependent Schrödinger equation for the hydrogen atom and show that this is not the case: the polarization is not simply proportional to the cube of the electric field even at low intensities. We analyze the fundamental-frequency and third-harmonic nonlinear susceptibilities of hydrogen, investigate their dependence on intensity, and find that the delays in the Kerr response rapidly approach the femtosecond time-scale at higher intensities, while the delays in the third harmonic generation remain much lower. We also propose an experimental scheme to detect and characterize the above effects.

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Keywords
Atoms, Hydrogen, Nonlinear optics, Fundamental frequencies, Hydrogen atoms, Low frequency fields, Low-intensity, Non-linear response, Optical nonlinear, Optical response, Short optical pulse, Third order, Time dependent
Citation
Morales, F., Richter, M., Ivanov, M., & Husakou, A. (2022). Non-instantaneous third-order optical response of gases in low-frequency fields. 30(13). https://doi.org//10.1364/OE.458765
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Optica Open Access Publishing Agreement