A device (110) for illuminating a particle comprises: a light waveguide (112; 412a, 412b; 512a, 512b) arranged on a substrate (114); an output coupler (118) configured to output a light beam (150; 450a, 450b; 550a, 550b) forming a sheet-like shape having a cross-section which has an extension in a first direction being larger than a size of a particle; and a fluidic channel (116; 416; 516) arranged on the substrate (114) for guiding a flow of particles along a longitudinal direction of the fluidic channel (116; 416; 516); wherein the sheet-like shape of the light beam (150; 450a, 450b; 550a, 550b) is arranged within the fluidic channel (116; 416; 516) and the first direction of the cross-section of the light beam (150; 450a, 450b; 550a, 550b) forms an angle to the longitudinal direction of the fluidic channel (116; 416; 516). A system (100) for imaging the particle comprises the device, an array (130; 430a, 430b; 530) of light-detecting elements (132; 432a, 432b; 532); and a lens (120) to converge light towards the array (130; 430a, 430b; 530) such that each light-detecting element (132; 432a, 432b; 532) detects light originating from a corresponding position in the fluidic channel (116; 416; 516).

Systems and methods for copying a diversity of hologram prescriptions from a common master in accordance with various embodiments of the invention are illustrated. One embodiment includes a method of contact copying a hologram from a master. The method includes steps for providing a light source, a master grating encoding a first grating prescription, a substrate supporting a layer of holographic recording material, and a wavefront modifying component, forming a first wavefront from the light source, reflecting the first wavefront from the wavefront modifying component to provide a second wavefront, diffracting the second wavefront to provide diffracted light with a third wavefront and zero-order light with the second wavefront, interfering the third wavefront and the zero-order light at a contact image plane, and forming a hologram having a second grating prescription different from the first grating prescription.

Provided is a hologram transcription apparatus including: an exposure part; and a light source part for irradiating light to the exposure part. Here, the exposure part includes a transfer unit for transferring a hologram film, and the exposure part is rotatable to change an angle formed with the light.

A holographic optical element and a manufacturing method thereof, an image reconstruction method, and augmented reality glasses are disclosed. The holographic optical element includes a substrate, and a recording material layer in which at least two groups of interference fringes are recorded; each group includes a first interference fringe formed by a first signal light and a first reference light respectively incident from opposite sides of the recording material layer, and a second interference fringe formed by a second signal light and a second reference light respectively incident from opposite sides of the recording material layer; the second signal light passes through a lens before incidence; incident angles of the first signal light and the second reference light are equal; incident directions of the first signal light corresponding to respective groups are different, and focal lengths of the lenses are not equal.

Example embodiments relate to methods and imaging systems for holographic imaging. One embodiment includes a method for holographic imaging of an object. The method includes driving a laser using a current which is below a threshold current of the laser. The method also includes illuminating the object using illumination light output by the laser. Further, the method includes detecting an interference pattern formed by object light, having interacted with the object, and reference light of the illumination light.

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.

A method for observing a sample by lensless imaging, in which a sample is positioned between a laser diode and an image sensor, the laser diode being supplied with a supply current whose intensity is less than or equal to a critical value. This critical intensity is determined during preliminary operations, during which the intensity is initially greater than a laser threshold of the diode. By observing the image formed at the image sensor, the intensity is decreased until an attenuation of the interference images on the formed image is observed, the critical intensity corresponding to the intensity at which this attenuation is optimum.

The present disclosure relates to improved holographic reconstruction device and a method. In one aspect, the present disclosure relates to improved holographic reconstruction device and method that can measure a digital hologram regardless of optical characteristics of an object to be measured, by an all-in-one type system integrating a transmissive system that measures an object transmitting light and a reflective system that measures an object reflecting light.

The present disclosure presents systems, apparatuses, and methods of holographic imaging. In this regard, a method comprises transmitting light and illuminating a semi-transparent sample object; and forming, at a hologram plane, an interference pattern of a real image of the sample object from a scattered object beam and an unscattered reference beam from the transmitted light. To do so, the scattered object beam and the unscattered reference beam are in-line with one another, and a distance between the hologram plane to the sample object is set at a distance that substantially weakens a virtual image of the sample object formed from the scattered object beam and the unscattered reference beam. Accordingly, the method further comprises recording the interference pattern of a hologram formed from the scattered object beam and the unscattered reference beam at a detector; and reconstructing a 3D optical field of the hologram without phase retrieval.

A holographic optical element and a method for producing the same are disclosed herein. In some embodiments, a method includes illuminating a first surface of a photopolymer resin layer, where the photopolymer resin layer comprises a photopolymer resin, illuminating a second surface of the photopolymer resin layer through a retardation layer disposed in the second surface, wherein the second surface is opposite the first surface, and recording an interference pattern in the photopolymer resin layer, wherein the interference pattern is created by interference between the first parallel laser beam and the second parallel laser beam. The holographic optical element is produced using a retardation layer to prevent an unwanted interference pattern from being formed in the process of recording an interference pattern in a photopolymer resin layer.