A focus modulation optical system and a holographic display device having the focus modulation optical system are disclosed. The holographic display device includes a light source configured to emit a plurality of color lights, a focus modulation optical system including at least one variable focus lens that is configured to change a focusing position of incident light by electrical control of the at least one variable focus lens based on a color of light incident on the variable focus lens, and a spatial light modulator configured to form a holographic image by diffracting light output from the focus modulation optical system.

A method, system, and computer program product for holographically displaying and navigating data content of a mobile device is provided. The method may include retrieving data content comprising an arrangement of data objects, wherein a size of the data content exceeds a predetermined threshold. Visualized data content may be generated based on the data content. The visualized data content is rendered for display by holographic projection with respect to on-screen data content, displayed by a touchscreen of the mobile device.

A method for digitally generating a hologram plane from a three-dimensional scene, cut into a plurality of planes parallel to the hologram plane. The method includes for a current plane: counting a number of points of the non-zero amplitude scene; choosing a first or second technique for propagating a light wave emitted by the current plane as a function of a number of points of non-zero amplitude included in the current plane and with a preset threshold value, the first, point-based technique calculating the propagation of a sum of light waves emitted by point sources constituted by the points of the scene portion of a non-zero amplitude of the current plane on a following plane, and the second, field-based technique, globally calculating a light wave emitted by the scene portion situated in the current plane on a given plane; and processing the current plane according to the chosen propagation technique.

A projection system that facilitates the use of in-situ detection of a change in wavelength, thereby enabling appropriate compensation or corrections to be applied on the fly to improve the quality of the image in the primary image region. In-situ detection in this manner can allow wavelength changes due to both temperature fluctuations and hardware variations to be compensated for simultaneously, thereby reducing the time and expense for end of line hardware testing, and removing the need to perform in-situ mapping of the wavelength as a function of temperature. In this way, the quality of the image provided to a user can be improved in a simpler, more efficient manner.

A number of techniques provide a data efficient and/or computation efficient computer-generated holography, examples of which may be implemented on low-power devices such as smartphones and virtual-reality/augmented-reality devices and provide high fidelity holographic images. The techniques include used of layered depth image representations and end-to-end training of neural network generation of double-phase hologram encoding.

An illumination unit emits illumination light to a specimen held by a sample holder, which includes an AF mark that changes at least the amplitude or phase of part of the illumination light. An image sensor includes multiple pixels two-dimensionally arranged on an imaging surface, captures an image of the intensity distribution of an interference pattern formed on the imaging surface, and outputs captured image data. An AF operation unit generates a first intensity distribution representing a measurement value of the interference pattern corresponding to the AF mark based on the captured image data, generates a second intensity distribution representing a calculation value of an interference pattern corresponding to the AF mark by calculation, and executes an autofocus operation wherein the first intensity distribution approaches the second. A reconstruction calculation unit reconstructs a subject image representing the specimen based on the captured image data.

The present disclosure discloses a hologram recording device and a hologram recording method. The hologram recording device comprises an object imaging unit comprising a cavity for accommodating an object whose interior wall is a reflective surface, and a light modulating unit configured to produce incident light and reference light interfering with the incident light and to direct the incident light to the object imaging unit. The cavity is provided with an imaging aperture for imaging of the object and at least one light incidence aperture for allowing the incident light to enter the cavity and irradiate on the object, such that an image of the object is formed at a location corresponding to the imaging aperture outside the cavity, and image light produced upon the imaging of the object interferes with the reference light at the location for recording of an image surface hologram.

An optical device includes one or more volume phase holographic gratings each of which includes a photosensitive layer whose optical properties are spatially modulated. The spatial modulation of optical properties are recorded in the photosensitive layer by generating an optical interference pattern using a beam of light and one or more liquid crystal master gratings. The volume phase holograms may be configured to redirect light of visible or infrared wavelengths propagating in free space or through a waveguide. Advantageously, fabricating the volume phase holographic gratings using liquid crystal master grating allows independent control of the optical function and the selectivity of the volume phase holographic grating during the fabrication process.

Methods and apparatus are configured for focusing and imaging of translucent materials with decreased size and complexity and improve resolution. The methods and apparatus provide improved focusing and imaging with decreased size and weight, so as to allow use in many fields.

Holographic optical elements for augmented reality (AR) devices and methods of manufacturing and using the same are disclosed. An example AR device includes a holographic optical element (HOE) including a recorded optical function, and a projector to emit light toward the HOE. The HOE reflects the light based on the optical function to produce a full image corresponding to content perceivable by a user viewing the reflected light from within an eyebox. A first portion of the content is viewable from a first location within the eyebox. A second portion of the content is viewable from a second location within the eyebox. The first portion including different content than the second portion that is non-repeating between the first and second portions.