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23 April 2024

» arxiv » 0905.0278

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Nonlinear ultrafast modulation of the optical absorption of few cycle terahertz pulses in n-doped semiconductors
L Razzari ; F H Su ; G Sharma ; F Blanchard ; A Ayesheshim ; H-C Bandulet ; R Morandotti ; J-C Kieffer ; T Ozaki ; M Reid ; F A Hegmann ;
Date:	3 May 2009
Abstract:	We use an open-aperture Z-scan technique to show how intense few-cycle terahertz pulses can experience a nonlinear bleaching of absorption in an n-doped semiconductor due to terahertz-electric-field-driven intervalley scattering of electrons in the conduction band. Coherent detection of the transmitted terahertz pulse waveform also allows the nonlinear conductivity dynamics to be followed with sub-picosecond time resolution. Both the Z-scan and time-domain results are found to be in agreement with our theoretical analysis.
Source:	arXiv, 0905.0278
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