A holographic display apparatus capable of providing an expanded viewing window and a display method are provided. The holographic display apparatus includes an image processor configured to provide computer generated hologram (CGH) data to a spatial light modulator, wherein the image processor is further configured to generate a hologram data array comprising information of the holographic image to be reproduced at the first resolution or a resolution less than the first resolution, perform an off-axis phase computation on the hologram data array at the second resolution, and then, generate the CHG data at the first resolution.

A phase modulation data generating unit according to the present disclosure includes: a first calculating section; and a storage section. The first calculating section calculates basic phase modulation pattern data on the basis of a partial illumination image pattern that makes it possible to generate an intended illumination image pattern having a desired luminance distribution. The basic phase modulation pattern data makes it possible for a light phase modulation device to reconstruct the partial illumination image pattern. The storage section stores the basic phase modulation pattern data calculated by the first calculating section.

A multi-beam volumetric resin curing system and method for whole-volume additive manufacturing of an object includes a bath containing a photosensitive resin, a light source for producing a light beam, and a spatial light modulator which produces a phase- or intensity-modulated light beam by impressing a phase profile or intensity profile of an image onto a light beam received from the light source. The system and method also include projection optics which then produces multiple sub-image beams from the modulated light beam which are projected to intersect each other in the photosensitive resin to cure select volumetric regions of the resin in a whole-volume three-dimensional pattern representing the object.

Provided are an apparatus for displaying a holographic image and a method of controlling the apparatus. The apparatus for displaying the holographic image includes a controller, a light source, an optical system, a spatial light modulator, a filter, an electric optical scanner, a multi-channel projection optics, and a screen. The spatial light modulator modulates a light beam passing through the optical system according to a predetermined subframe sequence of holographic image frames, the filter performs spatial-angular filtering of the modulated light beam to exclude parasitic diffraction order components from the modulated light beam, and the electric optical scanner directs the modulated and filtered light beam towards a corresponding channel of the multi-channel projection optics and forms a plurality of viewing zones on a focal plane of a field lens provided in the screen.

An optical filter to increase contrast of an image generated with a spatial light modulator includes a lens for spatially Fourier transforming modulated light from the spatial light modulator, and an optical filter mask positioned at a Fourier plane of the lens to filter the modulated light. The modulated light has a plurality of diffraction orders, and the optical filter mask transmits at least one of the diffraction orders of the modulated light and block a remaining portion of the modulated light. A method that improves contrast of an image generated with a spatial light modulator includes spatially Fourier transforming modulated light from the spatial light modulator onto a Fourier plane, and filtering the modulated light by transmitting at least one diffraction order of the modulated light at the Fourier plane and blocking a remaining portion of the modulated light at the Fourier plane.

A hologram reproducing apparatus is provided that includes a display configured to emit a write beam corresponding to a hologram pattern, a spatial light modulator (SLM) configured to write the hologram pattern according to the write beam and modulate the reproduction beam into a plurality of diffraction beams corresponding to the hologram pattern if a reproduction beam is incident, a light guide plate disposed in a front surface of the SLM, and configured to guide the reproduction beam toward the SLM, a filter configured to filter the plurality of diffraction beams, a lens configured to focus the plurality of diffraction beams filtered through the filter, and a plurality of optical fibers arranged in order to dispose at least one optical fiber to correspond to each of a plurality of pixels included in the display, and configured to transmit the write beam to the SLM.

A holographic projector having an optical path is described. The holographic projector comprises a first spatial light modulator arranged to display a first hologram, and a first light source. The first light source is arranged to illuminate the first spatial light modulator with light of a first wavelength such that a first holographic reconstruction corresponding to the first hologram is formed on a replay plane. The holographic projector further comprises a continuous block of transparent material. At least part of the optical path is formed through the continuous block of transparent material. The transparent material has a refractive index greater than air.

A three-dimensional (3D) holographic display system includes a projector that generates an image with a form of spatially varying modulation on a light beam; holographic processor that performs a holographic method on the image generated by the projector; and memory device that stores holographic data generated in a process of performing the holographic method by the holographic processor. An amplitude of a light field is adaptively replaced by the holographic processor according to significance of respective areas of the image.

A projection device comprises: a spatial light modulator having a display unit whereon a pattern corresponding to a display image is presented; a light source arranged to irradiate the display unit with emission light; a projection optical system arranged on the optical path of the reflected light of the emission light incident on the display unit and projecting projection light with the high order component included in the reflected light removed therefrom; and a projection control unit that causes the display unit to present a composite image that combines an image formed by a virtual lens that focuses the emission light incident on the display unit at a first focus position with the pattern corresponding to the display image, and controls the light source so that the display unit is irradiated with the emission light.

Provided are a system and method for digital holographic imaging which are not affected by external vibrations. The system for digital holographic imaging includes a light source and optical system section configured to split generated beams and including a sample through which the beams pass, a lens, and a grating disposed behind the lens; an object signal acquisition section configured to receive the split beams and acquire an interference signal; and an image processor configured to acquire a three-dimensional (3D) image of an object by using the acquired interference signal.