Optical nonlinearity in Ar and N2 near the ionization threshold.

  title={Optical nonlinearity in Ar and N2 near the ionization threshold.},
  author={Jared K. Wahlstrand and Y-H Cheng and Y. Chen and H. M. Milchberg},
  journal={Physical review letters},
  volume={107 10},
We directly measure the nonlinear optical response in argon and nitrogen in a thin gas target to laser intensities near the ionization threshold. No instantaneous negative nonlinear refractive index is observed, nor is saturation, in contrast with a previous measurement [Opt. Express 17, 13429 (2009)] and calculations [Phys. Rev. Lett. 106, 183902 (2011)]. In addition, we are able to cleanly separate the instantaneous and rotational components of the nonlinear response in nitrogen. In both Ar… CONTINUE READING
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