Abstract
We have calculated the propagation properties of a Gaussian beam from a high-numericalaperture (NA) optical system in a magneto-optical (MO) disk by combining an angular spectra analysis and optical matrix method. We obtained the optical and magneto-optical responses, the electric and magnetic field distributions, and the Joule loss profiles for the MO disk on which a Gaussian beam from dierent NA system was incident and compared the propagation properties of the Gaussian beam with those of a plane wave. The results show that the propagation properties of a Gaussian beam from an optical system with a high NA dier obviously from those of a plane wave, but a Gaussian beam with a larger spot diameter (e.g., greater than 100 µm) can be regarded as a plane wave for the considered disk structure.
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