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Effect of fabrication errors on multilevel Fresnel zone lenses

: Ferstl, M.; Kuhlow, B.; Pawlowski, E.


Optical engineering 33 (1994), No.4, pp.1229-35
ISSN: 0091-3286
ISSN: 0036-1860
Journal Article
Fraunhofer HHI ()
errors; integrated optics; lenses; optical workshop techniques; fabrication errors; multilevel fresnel zone lenses; blazed fresnel zone lenses; quartz glass; microstructuring technology; blazed profile; alignment errors; diffraction efficiency; parasitic foci; discrete level approximation

Blazed Fresnel zone lenses for the 1.5 mu m wavelength were fabricated in quartz glass by means of microstructuring technology. The blazed profile in each zone of the lenses was approximated by two, four, and eight discrete levels. The effects of fabrication errors, such as depth and alignment errors, on the diffraction efficiency of the different Fresnel zone lenses were investigated. Further the location and intensity of the parasitic foci appearing due to the discrete level approximation are calculated. Theoretical results along with experimental measurements are presented.