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Ultrafast time-resolved quantum beats in the polarization state of coherent emission from quantum wells

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Abstract

Dual-channel spectral interferometry is used to measure the ellipticity, the orientation of the polarization ellipse, and the sense of rotation of the four-wave-mixing signal from a GaAs–AlGaAs multiple quantum well. Each parameter is observed to oscillate dramatically at the heavy-hole–light-hole quantum beat frequency. During each beat period (in the strong quantum beat regime), the ellipticity oscillates twice between linear and almost-circular polarization, the orientation of the polarization ellipse rotates through a complete 180°, and the sense of rotation changes from left- to right-circular polarization.

© 1998 Optical Society of America

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