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    "headline": "The Kerr Response Is Measured in the Field",
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    "dek": "Field-resolved pump-probe spectroscopy separated germanium's instantaneous nonlinear phase shift from delayed carrier effects at five micrometers.",
    "summary": "Field-resolved pump-probe spectroscopy separated germanium's instantaneous nonlinear phase shift from delayed carrier effects at five micrometers.",
    "body_text": "The measured phase followed the pump envelope and vanished when the pulses no longer overlapped. Its linear intensity scaling yielded a nonlinear refractive index of 0.87 plus or minus 0.16 times 10^-17 square meters per watt.",
    "why_it_matters": "Field-resolved pump-probe spectroscopy separated germanium's instantaneous nonlinear phase shift from delayed carrier effects at five micrometers.",
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    "tags": [
      "photonics",
      "Kerr effect",
      "semiconductors"
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      "title": "arXiv preprint 2610.42098, original v1",
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      "published_at": "2026-10-30T13:42:49.000-04:00",
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