  Optical properties of a two-dimensional quantum ring with pseudopotential in
the presence of an external magnetic field and magnetic flux have been
theoretically investigated. Our results show that both of the pseudopotential
and magnetic field can affect the third nonlinear susceptibility and oscillator
strength. In addition, we found that the oscillator strength and the absolute
value of the resonant peak of the linear, non-linear and total absorption
coefficient vary periodically with magnetic flux, while the resonant peak value
of the linear, non-linear and total refractive index changes decreases as
magnetic flux increases.
