| 摘要 |
The head comprises a light source (S), a polarizer (P), a parabolic mirror (MP1), a second parabolic mirror (MP2), a polarization converter grating (RCP), a reflector (M), a separating plate (LS) and a detector (D). The beam diffracted by (RCP) constitutes a reference beam and the beam which has passed through (RCP) an analysis beam. The interference state of these two beams is dependent upon the orientation of the magnetization of the support to be read.
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