Laser radiation effects on impurity states in a spherical quantum dot

An investigation of the laser radiation effects of a hydrogenic impurity in a spherical quantum dot has been performed by using the matrix diagonalization method. The binding energies, the optical absorption coefficients and the refractive index between the ground state (L=0) and the first excited state (L=1) have been examined based on the computed energies and wave functions. We find that the laser-field amplitude has an important influence on the binding energies, the linear, third-order nonlinear, and the total absorption coefficients as well as the refractive index changes.