Image-Degradation in a Two-Wave Mixing Spatial-Light Modulator,
Abstract
Optical real-time image processing by spatial light modulators (SLM's) that utilize photorefractive crystals has attracted much attention. The two-wave mixing SLM is based on the selective spatial erasure of the uniform phase volume hologram created by the two plane coherent beams using an incoherent image bearing beam I sub inc yield above (r) resulting in an additional spatial modulation of the refractive index distribution n sub 1 yield above (r) (commonly with a greater spatial period then the grating period of the hologram). The parameters of these Bragg-type SLM's are strongly determined by the diffraction properties of the nonuniform volume gratings and are analyzed here by means of the two-wave mixing coupled-wave formalism in it's two-dimensional description.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1992
- Accession Number
- ADP006709
Entities
People
- G. Notni
- R. Kowarschik
Organizations
- Friedrich Schiller University Jena