Showing papers by "Rasheed M. A. Azzam published in 1996"
TL;DR: A 16-beam grating-based division-of-amplitude photopolarimeter that employs a transmission grating and a linear photodiode detector array has been developed and tested as discussed by the authors.
Abstract: A 16-beam grating-based division-of-amplitude photopolarimeter that employs a transmission grating and a linear photodiode detector array has been developed and tested. The transmission grating splits the incident light beam into 16 orders with essentially uniform intensity distribution. Linear polarizers are placed in fanned-out azimuth orientations in different orders, and a quarter-wave retarder is inserted in one order. After calibration, the photopolarimeter makes time-resolved measurements of all the Stokes parameters of the incident light with a precision of 0.001. The calibration and testing of the system at 632.8 nm are presented.
23 citations
16 Aug 1996
TL;DR: In this paper, a fast measurement of the complete state of polarization (SOP) of light, as determined by the four Stokes parameters, is performed by dividing the light beam whose SOP is to be measured, into four or more beams that are intercepted by discrete (or array) photodetectors.
Abstract: Fast (submillisecond) measurement of the complete state of polarization (SOP) of light, as determined by the four Stokes parameters, requires instruments that have no moving parts or modulators. This is accomplished by dividing the light beam, whose SOP is to be measured, into four or more beams that are intercepted by discrete (or array) photodetectors. The output electrical signals of at least four detectors (or array pixel groups) provide four linearly independent projections of the unknown Stokes vector of the incident light. This requires judicious choices of the beam splitting and polarizing optics.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
5 citations
TL;DR: In this paper, the authors determined all possible combinations of the thicknesses of the two layers such that the differential reflection phase shift between the p and s polarizations Δ = ± 90 ° for monochromatic light incident at a given angle θ.
1 citations
16 Aug 1996
TL;DR: In this article, the extinction ratio and the reflectance for infrared reflection polarizers that consist of a low- index transparent layer embedded in a high-index transparent substrate are calculated for both uniform and diffuse Gaussian layers.
Abstract: The extinction ratio ER and the reflectance, or throughput, for the unextinguished s polarization Rs are calculated for infrared reflection polarizers that consist of a low- index transparent layer embedded in a high-index transparent substrate. Iso-ER and iso-Rs contours illustrate the dependence of the ER and Rs for a specific IR polarizer on the depth and width of a buried layer of SiO2 in Si at 3.5-micrometers wavelength and 80 degree(s) angle of incidence. Both cases of a uniform layer with sharp boundaries and a diffuse Gaussian layer are considered. The diffuse-layer model employs Bruggeman's effective medium theory and is intended to simulate devices that are fabricated by the oxygen-ion implantation of Si. The angular and wavelength sensitivities of these polarizers are determined.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.