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Nonlinear absorption of terahertz radiation due to light impact ionization

Ganichev, Sergey


A nonlinear increase in free carrier absorption in InSb bulk samples with rising intensity of terahertz radiation has been observed. It is shown that the effect is caused by a generation of electron-hole pairs at intense excitation with photon energies several factors of ten smaller than the energy gap. The experimental results give strong evidence that the increase of carrier density is caused ...


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