Effects of Spatial Light Modulator Transmissive and Reflective Dead Zones on Optical Correlation.
Abstract
We present both analytical calculations and computer simulations for optical correlation in correlators using pixellated Spatial Light Modulators (SLM) with transmissive (or reflective) dead zones. The input plane SLM modulates the intensity in its active areas while its dead zones transmit (or reflect) all of the light. ln the filter plane SLM the dead zones are similar,but the active areas modulate both phase and transmittance to produce either a phase-only filter, a binary phase-only filter, or a classical matched filter. When these dead zones appear in the input plane, we add a dc block in the filter plane for noise reduction and use a filter reference image that is smaller than the input SLM size to reduce false correction peaks. We calculate the correlation peak intensity, the signal-to-noise ratio and the energy throughput efficiency as a function of dead zone area in both the input and filter plane SLMs. Analysis shows that the opaque dead zone results are a special case of the transmissive dead zone results. We also calculate peak intensities when one SLM has opaque dead zone and the other, transparent dead zone.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1992
- Accession Number
- ADA291674
Entities
People
- Charles Woods
- Peter D. Gianino
Organizations
- Rome Laboratory