Provided is a method of manufacturing a full-color holographic optical element in a full-color holographic optical element manufacturing apparatus including a lens and a holographic recording medium located farther away than a focal length of the lens, the method including: allowing a signal beam including a mixture of laser beams having wavelengths of R (Red), G (Green), and B (Blue) to be incident on the lens; and recording a hologram in such a manner that a reference beam including a mixture of laser beams having wavelengths of R, G, and B is allowed to be incident on the holographic recording medium, wherein the holographic recording medium is configured with a single medium.

A mobile device is provided which is capable of displaying a hologram. The mobile device includes a main body including a screen; a light guide member disposed above the screen; an entrance optical member disposed on a surface of the light guide member; and an image hologram disposed on a surface of the light guide member and laterally spaced apart from the entrance optical member. When an area of the screen corresponding to the entrance optical member emits a light, a holographic image stored in the image hologram is displayed above the light guide member.

An illumination device has a coherent light source that emits coherent light beam, and an optical device that diffuses the coherent light beam, wherein the optical device comprises a first diffusion region that diffuses the coherent light beam to illuminate a first area, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area.

A method of holographic projection includes projecting at least one calibration image. The method includes performing the following steps for each calibration image in order to determine a plurality of displacements vectors at a respective plurality of different locations on the replay plane: projecting the calibration image onto the replay plane using a first colour holographic channel by displaying a first hologram on a first spatial light modulator and illuminating the first spatial light modulator with light of the first colour; projecting the calibration image onto the replay using a second colour holographic channel by displaying a second hologram on a second spatial light modulator and illuminating the second spatial light modulator with light of the second colour, the first and second hologram corresponding to the calibration image; determining the displacement vector between the light spot formed by the first colour holographic channel and the light spot formed by the second colour holographic channel; and pre-processing an image for projection using the second colour holographic channel in accordance with the plurality of determined displacement vectors.

Provided is a holographic display apparatus. A holographic image display apparatus includes: a light source configured to emit light, the light source including a plurality of vertical-cavity surface-emitting lasers (VCSELs) that are spaced apart from one another; a spatial light modulator configured to, based on a hologram data signal, modulate the light emitted by the light source; and a focusing optical system configured to focus an image formed by the spatial light modulator using a Maxwellian view method.

A method for observing a sample (10), the sample lying in a plane of the sample defining radial coordinates, the method comprising the following steps: a) illuminating the sample using a light source (11), able to emit an incident light wave (12) that propagates toward the sample along a propagation axis (Z); b) acquiring, using an image sensor (16), an image (I.sub.0) of the sample (10), said image being formed in a detection plane (P.sub.0), the sample being placed between the light source (11) and the image sensor (16), such that the incident light wave sees an optical path difference, parallel to the propagation axis (Z), by passing through the sample; c) processing the image acquired by the image sensor;
wherein the processing of the acquired image comprises taking into account vectors of parameters, respectively defined at a plurality of radial coordinates, in the plane of the sample, each vector of parameters being associated with one radial coordinate, and comprising a term representative of an optical parameter of the sample, at least one optical parameter being an optical path difference induced by the sample at the radial coordinate, the vectors of parameters describing the sample.

A method for determining a parameter of a particle present in a sample, the method comprising the following steps: a) illuminating the sample with the light source, the light source emitting an incident light wave that propagates along a propagation axis; b) acquiring an image of the sample with the image sensor, the image sensor being exposed to an exposure light wave; c) determining a position of the particle in the detection plane; d) on the basis of the acquired image, applying a propagation operator, for a plurality of distances from a detection plane, so as to estimate, at each distance, a complex amplitude of the exposure light wave; e) on the basis of the complex amplitude estimated, at various distances, obtaining a profile representing a variation of the complex amplitude of the exposure light wave along an axis parallel to the propagation axis and passing through the position of the particle.

The particle may associated with a set of parameters, comprising at least a size of the particle and a refractive index of the particle.

An information processing apparatus according to an embodiment of the present technology includes an acquisition unit, a calculation unit, and a display controller. The acquisition unit acquires image data in which an interference fringe of illumination light passing through liquid including a cell is recorded. The calculation unit calculates cell information regarding the cell by performing propagation calculation on the illumination light on the basis of the image data. The display controller controls display of a monitoring image indicating a temporal change in the cell information.

The invention enables a desired projection pattern on a surface to be illuminated, and enables a projection position and/or a projection orientation of the projection pattern to be changed. A laser beam is shaped into a parallel light, and an incident surface of a diffraction optical element recording a hologram image is irradiated with the parallel light. A projection pattern of an arrow oriented in a predetermined direction is projected as a hologram reconstructed image on a surface to be illuminated. An optical-element drive unit rotates the diffraction optical element about a rotation axis in a rotation plane orthogonal to an optical axis of a parallel incident light. By means of the rotation, a geometric positional relationship of the diffraction optical element with respect to the surface to be illuminated is changed, whereby an orientation of the arrow projection pattern on the surface can be changed.

An illumination device is provided, including a coherent light source that emits coherent light beam and an optical device that diffuses the coherent light beam. The optical device includes a first diffusion region that diffuses the coherent light beam to illuminate a first area, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area. A timing control unit individually controls a light emission timing at which the coherent light source emits the coherent light so that the coherent light is irradiated to the first diffusion region and the second diffusion region, an incident timing at which the coherent light from the coherent light source is incident on the first diffusion region and the second diffusion region, or an illumination timing at which the coherent light diffused by the optical device illuminates the first area and the second area.