| 摘要 |
There is provided a method of moving the position of the focal point of an optical system in an optical data storage device. A membrane reflector having an electrically controllable surface contour is provided in the optical system and the reflector's surface contour is controlled so as to move the focal point on the data storage medium of the optical data storage device. The optical system comprises a source of plane-polarized light, a polarizing beam splitter, first and second quarter-wave plates, the membrane reflector and an objective lens.
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