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Multi-wavelength optical pickup with diffractive optical elements

: Pawlowski, E.; Dobschal, H.-J.; Falkenstorfer, O.; Furst, W.; Steiner, R.; Steingrüber, R.


Journal of modern optics 47 (2000), Nr.13, S.2437-2453
ISSN: 0950-0340
ISSN: 1362-3044
Topical Meeting on Diffractive Optics <1999, Jena>
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer HHI ()
diffractive optical elements; optical design techniques; optical fabrication; optical focusing; optical storage; pick-ups; multi-wavelength optical pickup; multi-wavelength diffractive optical pickup; multi-focus imaging; data transfer rate; parallel reading; full-width at half-maximum spot intensity; doe-pickup; diffraction limited predicted value; good optical performance; diffraction efficiencies; 92 percent

A novel, to our knowledge, multi-wavelength diffractive optical pickup is presented. The pickup enables multi-focus imaging and increases the data transfer rate considerably. Parallel reading of two or more memory layers is possible. The different spots can be controlled independently. The optical pickup consists of different diffractive optical elements (DOEs). The measured full-width at half-maximum (FWHM) spot intensity for the DOE-pickup is 0.76 mu m-close to the diffraction limited predicted value of 0.71 mu m-indicating good optical performance. The measured highest diffraction efficiencies of the realized DOEs are about 92%.