Patent
Pixelated phase-mask interferometer
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TLDR
In this paper, a phase-difference sensor is proposed to measure the spatially resolved difference in phase between orthogonally polarized reference and test wavefronts, which can be constructed as a pixelated phase-mask aligned to and imaged on a pixel-ated detector array.Abstract:
A phase-difference sensor measures the spatially resolved difference in phase between orthogonally polarized reference and test wavefronts. The sensor is constructed as a pixelated phase-mask aligned to and imaged on a pixelated detector array. Each adjacent pixel of the phase-mask measures a predetermined relative phase shift between the orthogonally polarized reference and test beams. Thus, multiple phase-shifted interferograms can be synthesized at the same time by combining pixels with identical phase-shifts. The multiple phase-shifted interferograms can be combined to calculate standard parameters such as modulation index or average phase step. Any configuration of interferometer that produces orthogonally polarized reference and object beams may be combined with the phase-difference sensor of the invention to provide, single-shot, simultaneous phase-shifting measurements.read more
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References
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Patent
Broadband wire grid polarizer for the visible spectrum
TL;DR: In this article, a broadband wire grid polarizer (400) for the visible spectrum has a plurality of elongated elements (1240) supported on a substrate (1210), and a region having a lower refractive index than the substrate is disposed between the elements and the substrate to reduce the longest wavelength at which resonance occurs.
Journal ArticleDOI
Micropolarizer Array for Infrared Imaging Polarimetry
TL;DR: In this paper, the design and fabrication of a micropolarizer array for imaging polarimetry is described for the 3-5-µm-wavelength region, where interference lithography is used to generate small grating features through an etch mask layer.
Patent
Polarizer apparatus for producing a generally polarized beam of light
Douglas P. Hansen,John Gunther +1 more
TL;DR: In this paper, a polarizing system having a light source (23) and a polarising device (10) is described, where the polarizing device is disposed in an unpolarized source light beam for transmitting a transmitted light beam (24) having a first polarization and reflecting a reflected light beam having a second polarization.
Patent
Broad band wire grid polarizing beam splitter for use in the visible wavelength region
TL;DR: A wire grid polarizing beam splitter has a generally parallel arrangement of thin, elongated elements which interact with electromagnetic waves of a source light beam to generally transmit or pass light of one polarization, and reflect light of the other polarization.
Patent
Methods and apparatus for splitting, imaging, and measuring wavefronts in interferometry
James E. Millerd,Neal Brock +1 more
TL;DR: In this article, a wavefront-splitting element splits the combined wavefront into a plurality of sub-wavefronts in such a way that each of the sub wavefronts is substantially contiguous with at least one other subwavefront.