Determination of the reflection coefficients of laser light of wavelengths lambda(0.22 microm,200 microm) from the surface of aluminum using the Lorentz-Drude model.

Using four different fitting methods, the applicability of the Lorentz-Drude (LD) model has been investigated for calculating the reflection coefficients of the laser light of wavelengths of lambda(0.22 microm,200 microm) from the surface of aluminum. The applicability of the LD model has been established not only in the IR region but also in the visible and UV regions. The values of plasma frequency omega(rho) and damping frequency I have been determined. The values of the reflection coefficients calculated by the LD model have been compared with corresponding experimental values. It has been established that in both the far and medium IR region as well as in both the visible and UV, discrepancies are smaller than 3%. The maximum discrepancy is smaller than 7% and occurs in a narrow region (~lambda = 0.825 microm), where aluminum strongly absorbs caused by band-band transitions.