  In this paper, we study the exciton absorption spectra in InGaAs prolate
ellipsoidal quantum dots when a strong pump laser resonant with electron
quantized levels is active. Our obtained results by renormalized wavefunction
theory show that, under suitable conditions, the initial exciton absorption
peak is split into two new peaks as the evidence of the existence of the
three-level optical Stark effect of excitons. We have suggested an explanation
of the origin of the effect as well as investigating the effect of pump field
energy, size, and geometric shape of the quantum dots on effect
characteristics. The comparison with the results obtained in the spherical
quantum dots implies the important role of geometric shape of the quantum
structures when we examine this effect.
