An apparatus for capturing a Fourier hologram splits a coherent light source into an object beam and a reference beam, sets a distance of a virtual focal plane of a subject, generates spherical wave field data propagated from a point source of the virtual focal plane to a central coordinate plane of a spatial light modulator, generates a spherical wave field on a space from the spherical wave field data and the reference beam by the spatial light modulator, synthesizes an object wave field generated by reflecting the object beam by the subject and the spherical wave field with each other so that an interference pattern is formed on the image sensor face, captures the interference pattern formed on the image sensor face, and then performs Fourier transformation to calculate an object wave field formed on the focal plane of the subject.

A near-eye display device and a wearable device having the same. The near-eye display device includes a laser generation module, an optical waveguide element, and a holographic optical element; the laser generation module is configured to emit parallel laser beams; the optical waveguide element has an in-coupler area and an out-coupler area, the optical waveguide element is configured to receive the parallel laser beams and output the parallel laser beams in parallel after one-dimensional pupil expansion or two-dimensional pupil expansion; the holographic optical element has interference fringes and is attached to the out-coupler area, the holographic optical element is configured to receive the parallel laser beams from the optical waveguide element and to reflect or transmit the parallel laser beams by diffraction to output a plurality of converging image light beams.

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.

An imaging system includes an infrared illuminator, an ultrasonic emitter, a reference wavefront generator, and an image pixel array. The infrared illuminator emits a general illumination emission into a three-dimensional diffuse medium, where a portion of the general illumination emission encounters a voxel within the diffuse medium. The ultrasonic emitter focuses an ultrasonic signal to the voxel to wavelength-shift the portion of the general illumination emission to generate a shifted infrared imaging signal. The reference wavefront generator generates an infrared reference wavefront having a same wavelength as the shifted infrared imaging signal. The image pixel array captures an infrared image of an interference between the shifted infrared imaging signal and the infrared reference wavefront.

A deflection optical element, which diffracts incident light, includes a substrate having translucency, and a holographic material layer disposed so as to overlap the substrate, the holographic material layer being formed with a diffraction grating composed of interference fringes, wherein the holographic material layer is formed with an alignment mark where the interference fringes are discontinuous, and the alignment mark is located in an optically effective area where the holographic material layer diffracts the incident light.

Example embodiments relate to imaging devices for in-line holographic imaging of objects. One embodiment includes an imaging device for in-line holographic imaging of an object. The imaging device includes a set of light sources configured to output light in confined illumination cones. The imaging device also includes an image sensor that includes a set of light-detecting elements. The set of light sources are configured to output light such that the confined illumination cones are arranged side-by-side and illuminate a specific part of the object. The image sensor is arranged such that the light-detecting elements detect a plurality of interference patterns. Each interference pattern is formed by diffracted light from the object originating from a single light source and undiffracted light from the same single light source. At least a subset of the set of light-detecting elements is arranged to detect light relating to not more than one interference pattern.

A copying device for generating a replication hologram that represents a copy of a master hologram. The device includes an object hologram for generating an object wave via a master signal, and a reference hologram for generating a reference wave with the aid of the master signal.

An imaging system includes an infrared illuminator, an ultrasonic emitter, a reference wavefront generator, and an image pixel array. The infrared illuminator emits a general illumination emission into a three-dimensional diffuse medium, where a portion of the general illumination emission encounters a voxel within the diffuse medium. The ultrasonic emitter focuses an ultrasonic signal to the voxel to wavelength-shift the portion of the general illumination emission to generate a shifted infrared imaging signal. The reference wavefront generator generates an infrared reference wavefront having a same wavelength as the shifted infrared imaging signal. The image pixel array captures an infrared image of an interference between the shifted infrared imaging signal and the infrared reference wavefront.

A laser beam (L50) is reflected by a light beam scanning device (60) and irradiated onto a hologram recording medium (45). On the hologram recording medium (45), an image (35) of a linear scatter body is recorded as a hologram by using reference light that converges on a scanning origin (B). The light beam scanning device (60) bends the laser beam (L50) at the scanning origin (B) and irradiates the laser beam onto the hologram recording medium (45). At this time, by changing a bending mode of the laser beam with time, an irradiation position of the bent laser beam (L60) on the hologram recording medium (45) is changed with time. Diffracted light (L45) from the hologram recording medium (45) produces a reproduction image (35) of the linear scatter body on a light receiving surface (R) of the stage 210. When an object is placed on the light receiving surface (R), a line pattern is projected by hologram reproduction light, so that the projected image is captured and a three-dimensional shape of the object is measured.

An infrared image is captured while an infrared reference wavefront and an infrared imaging signal are incident on an image pixel array. A frequency domain infrared image is generated by performing a transform operation on the infrared image. A filtered frequency domain infrared image is generated by applying a mask to the frequency domain infrared image to isolate a frequency representing the interference between the infrared reference beam and the incoming infrared image signal. Intensity data is generated from the filtered frequency domain infrared image. The intensity data is incorporated as a voxel value in a composite image.