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Proceedings Paper

Ultrafast manipulation of coherent excitons using ultrashort-pulse sequences prepared by frequency domain shaping
Author(s): Kazuhiro Komori; Takeyoshi Sugaya; Masanobu Watanabe
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Paper Abstract

In this paper, we report ultrafast manipulation of coherent excitons in quantum-wells using phase locked pulse sequence prepared by a frequency domain shaping technique. The pulse shaping system with double liquid crystal spatial light modulator (SLM) and the Ti3+-sapphire laser are used to generate phase-locked pulses. Ultrafast coherent control of exciton population and exciton polarization is demonstrated by the observation of the reflectivity-change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing measurements. In the single quantum wells, good coherent control characteristics with 87% of coherent carrier destruction is demonstrated at low excitation power of 0.15 mW (approximately 1.1 X 1010 photons/cm2). Also the preliminary manipulation of the exciton population is demonstrated by the phase locked multi-pulses. In case of coupled quantum-wells, the modulation of SLM is carefully controlled and coherent control of both the exciton population and the polarization are demonstrated in the two different coupled quantum well samples.

Paper Details

Date Published: 28 March 2000
PDF: 9 pages
Proc. SPIE 3940, Ultrafast Phenomena in Semiconductors IV, (28 March 2000); doi: 10.1117/12.381472
Show Author Affiliations
Kazuhiro Komori, Agency of Industrial Science and Technology and Japan Science Technology Corp. (Japan)
Takeyoshi Sugaya, Agency of Industrial Science and Technology (Japan)
Masanobu Watanabe, Agency of Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 3940:
Ultrafast Phenomena in Semiconductors IV
Kong-Thon F. Tsen; Jin-Joo Song, Editor(s)

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