23 July 1993 Fabrication of diffractive optical elements by laser-lithography
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 19837Q (1993) https://doi.org/10.1117/12.2308697
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
In optical disc systems, LDGU's (Laser Detector Grating Unit) are used to realize compact and robust lightpaths, where a hologram couples part of the laser light reflected from the disc onto a pair of split detectors to generate, apart from the information signal, the required servo control signals: the focus error signal by means of the Foucault method', and the tracking error signal by means of the (one- or three- spot) Push-Pull" (PP) method. The high power version of a LDGU contains a 40 mW laser and is intended for use in recordable systems (CD-R, MO-data, etc).
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Th. Dresel, Th. Dresel, } "Fabrication of diffractive optical elements by laser-lithography", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 19837Q (23 July 1993); doi: 10.1117/12.2308697; https://doi.org/10.1117/12.2308697
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