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High-intensity pulse propagation in semiconductors: on-resonant self-induced transmission and effects in the continuum

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Abstract

We perform high-intensity pulse propagation experiments in semiconductors. On a free-exciton resonance, we demonstrate coherent Self-Induced Transmission. Tuning the laser towards higher energy, thus exciting continuum states, the degree of transmission is reduced. The pulse breakup disappears. Increasing the pulse intensity by several orders of magnitude, pulse breakup can be observed again.

©1999 Optical Society of America

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Figures (4)

Fig.1.
Fig.1. (a), (b): Linear absorption spectra of the thin and thick CdSe epitaxial samples at T=8K. (c) Experimental crosscorrelation setup. The reference pulse has a duration of 50 fs.
Fig.2.
Fig.2. Propagation of 900 fs pulses through the thick CdSe sample with αL = 6.8 for increasing intensities. λ=684.5 nm. The crosscorrelation traces are shown at the left and the transmitted spectra are plotted at the right. Experiment, input intensities (top to bottom): 99, 31, and 5 MW/cm2. Propagation through substrate. Theory, pulse areas (top to bottom): 6.6π, 3.7π, 1.5π, propagation through substrate. The coherent pulse breakup for large intensities into several peaks is clearly visible.
Fig.3.
Fig.3. Propagation of a 900 fs pulse around 70 MW/cm2 on resonance (solid) and tuned 15 meV above the A exciton resonance (dashed) in the thick (αL=6.8) sample.
Fig.4.
Fig.4. Propagation of a 62 fs pulse tuned into the continuum in the thick sample at intensities of 13, 35, and 70 GW/cm2 (from bottom to top). Crosscorrelation traces are at the left and transmitted spectra are at the right.

Equations (2)

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Θ = d cv E ( t ) ħ dt ,
ħ Ω = d cv E + q k V k q P q ,
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