A power density model is introduced into the Delano diagram. The correlation of the system length and the peak power density are outline especially for 2-f-systems with a low Lagrange invariant and high energy transfer.
The dephasing time in semiconductor quantum dots and quantum-dot molecules is measured using a sensitive four-wave mixing heterodyne technique. We find a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly-confined InGaAs quantum dots, approaching the radiative-lifetime limit. Between 7 K and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian lineshape with a zero-phonon line and a broad band from elastic exciton-acoustic phonon interactions. On a series of InAs/GaAs quantum-dot molecules having different interdot barrier thicknesses a systematic dependence of the dephasing dynamics on the barrier thickness is observed. The results show how the quantum mechanical coupling of the electronic wavefunctions in the molecules affects both the exciton radiative lifetime and the exciton-acoustic phonon interaction.
This paper describes optical systems which compensate for the wavelength dispersion and distortion that arise in diffractive fan-out elements. Two approaches are investigated, a space variant and a space invariant. In the space variant approach, microlenses or diffractive optical elements were introduced in the system correcting the wavefronts. In the space invariant approach refractive and diffractive lenses compensates for the chromatic aberrations and shifts in beam direction that are caused by the fan-out element. Several designs for such compensating optical systems are presented, along with simulated results.
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