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Reduction of reflection losses at PMMA Fresnel lenses

: Jänchen, H.; Schulz, U.; Gombert, A.

Amra, C. ; European Optical Society -EOS-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Advances in Optical Interference Coatings : 25 - 27 May 1999, Berlin, Germany
Bellingham, Wash.: SPIE, 1999 (Europto series)
ISBN: 0-8194-3212-1
Conference on Advances in Optical Coatings <1999, Berlin>
Conference Paper
Fraunhofer IOF ()
antireflective coatings; Fresnel lenses; magnesium fluoride; plastics; PMMA; sub-wavelength structures

Fresnel lenses for projection optics require a reduction of reflection losses in a wide wavelength and angular range. Their surface relief consisting of inclined microstructures with increasing inclination angle causes a reduction in AR- coating thickness form center to the edges and hence a spectral shift.