Time-alternating method based on single-sideband holography with half-zone-plate processing for the enlargement of viewing zones

Abstract

The single-sideband method of holography, as is well known, cuts off beams that come from conjugate images for holograms produced in the Fraunhofer region and from objects with no phase components. The single-sideband method with half-zone-plate processing is also effective in the Fresnel region for beams from an object that has phase components. However, this method restricts the viewing zone to a narrow range. We propose a method to improve this restriction by time-alternating switching of hologram patterns and a spatial filter set on the focal plane of a reconstruction lens.

Three-dimensional reflection screens fabricated by holographic wavefront printer

“…Bruder et al claimed that a Fourier lens is needed to generate the phase function in a hologram printer using an amplitude SLM. However, we did not use a Fourier lens but electronic holography [15][16][17] technique to generate an arbitrary phase distribution. The optical system of our wavefront printer uses a collimated laser beam with 532-nm wavelength.…”

“…The object beam is modulated as a part of the entire wavefront on the hologram using subhologram data displayed on an SLM (JVC Kenwood Corporation D-ILA ® 4K2K LCOS). Undesirable lights, i.e., the transmission beam, high-order beam, and conjugate beam, are filtered out by a single-side band filter and a half-zone plate processing method [17][18][19] similar to an electronic holography system. [15][16][17] Then, the optical system demagnifies the modulated wavefront onto a holographic recording film made of covestro Bayfol ® HX102 photopolymer material.…”

Three dimensional motion picture technologies

“…whereby ϕ is the viewing-zone angle, d is the pixel pitch of the SLM device and λ is the wavelength of light [16]. As a result, the development of a spatial light modulator (SLM) with a very small pixel pitch has become extremely important in the realization of the electronic-holography images with wide viewing-zone angles.…”

Current-induced domain-wall motion in patterned nanowires with various Gd–Fe compositions for magneto-optical light modulator applications

“…[1][2][3][4][5][6][7][8] A magneto-optical spatial light modulator (MO-SLM) has been investigated [9][10][11][12][13] to realize a holography display with magnetic tunneling junctions (MTJs) in which magnetization reversal is driven by spin-transfer torque (spin-SLM). 10,12,13) An optical-address type MO-SLM has also been studied.…”