Ultrafast manipulation of coherent excitons using ultrashort-pulse sequences prepared by frequency domain shaping

Kazuhiro Komori; Takeyoshi Sugaya; Masanobu Watanabe

doi:10.1117/12.381472

28 March 2000 Ultrafast manipulation of coherent excitons using ultrashort-pulse sequences prepared by frequency domain shaping

Kazuhiro Komori, Takeyoshi Sugaya, Masanobu Watanabe

Author Affiliations +

Proceedings Volume 3940, Ultrafast Phenomena in Semiconductors IV; (2000) https://doi.org/10.1117/12.381472
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

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.

Citation Download Citation

Kazuhiro Komori, Takeyoshi Sugaya, and Masanobu Watanabe "Ultrafast manipulation of coherent excitons using ultrashort-pulse sequences prepared by frequency domain shaping", Proc. SPIE 3940, Ultrafast Phenomena in Semiconductors IV, (28 March 2000); https://doi.org/10.1117/12.381472

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