Pulse distortion in GaAs quantum wells studied by a light-gating technique | Zendy

Mitsuhiro Adachi | Zendy; Yasuaki Masumoto | Zendy

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Pulse distortion in GaAs quantum wells studied by a light-gating technique

Author(s) -

Mitsuhiro Adachi,

Yasuaki Masumoto

Publication year - 1989

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.40.2908

Subject(s) - exciton , picosecond , saturation (graph theory) , pulse (music) , quantum well , envelope (radar) , physics , absorption (acoustics) , atomic physics , optics , distortion (music) , resonance (particle physics) , materials science , laser , condensed matter physics , optoelectronics , telecommunications , radar , amplifier , mathematics , cmos , combinatorics , detector , computer science

The pulse distortion in GaAs quantum wells was studied by means of a light-gating technique. In the experiment, we used the incoherent picosecond pulse to observe accurately the changes of the coherent spike and its surrounding envelope. The experimental results clearly showed that the pulse is not anomalously delayed but is strongly distorted around the exciton resonance. We also compared the results with a computational simulation based on the absorption saturation mechanism. The simulated results agreed well with experimental results. The simulation showed that the recovery time of the exciton saturation is 90 ps around the tail part of the exciton absorption. We also observed a reduction of the coherent spike around the exciton resonance. Theoretical calculations indicate that the coherent-propagation effect in the linear absorber causes the reduction of the coherent spike

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