Abstract
We performed a numerical investigation of the dynamics of the optical Bloch equations, extended for near dipole-dipole (NDD) interactions in dense collections of two-level systems. As a function of peak field strength, the inversion that remains in the medium following excitation by an ultrashort optical pulse has step-like transitions between the ground state and the excited state. The medium is left fully inverted if the peak Rabi frequency (peak field strength written in units of frequency) is equal to the NDD interaction strength. Remarkably, this result is independent of pulse area. About this point is a region of peak field strength for which the dense medium is left fully, or nearly fully, inverted. On the weak side of this region, the dense medium is left in the ground state. On the strong side of this region, the medium alternates between absorbing (ground state) and amplifying (inverted) as a function of peak field strength. This response can be used to measure the strength of the NDD interaction, for coherent optical pumping, and also constitutes a new and unique intrinsic optical switch, which, unlike optical bistability, does not have hysteresis and is independent of dissipation from incoherent effects.
© 1992 Optical Society of America
PDF ArticleMore Like This
Jonathan P. Dowling and Charles M. Bowden
TuAA4 OSA Annual Meeting (FIO) 1992
Carlos Lizárraga C. and Alejandro B. Aceves
ThO2 OSA Annual Meeting (FIO) 1992
Yacob Ben-Aryeh and Charles M. Bowden
WD7 Optical Bistability (OBI) 1985