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 ω −4. 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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