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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1986),
  • paper TULL4

Saturation of the far-infrared linear and nonlinear susceptibilities of mobile carriers

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Abstract

The dynamical behavior of mobile electrons and holes in semiconductors leads to strong susceptibility variations over the IR. The linear optical absorption in Drude approximation varies proportionally to ω−2. This roll-off is enhanced in the nonlinear response. Thus the lowest-order nonlinear optical susceptibility which is χ(3),1 involving four waves as in frequency tripling, scales as ω4. Therefore, χ(3) is much higher in the far-IR than at the CO2 laser frequency where a previous assessment was made.2

© 1986 Optical Society of America

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