An optical device includes a first backlight configured to output first light of a first wavelength through a first output coupler, a first lens disposed to face the first output coupler and having a focal length with respect to the first light, a second backlight including a second output coupler, the second backlight being configured to output second light of a second wavelength through the second output coupler, a second lens disposed to face the second output coupler and having different focal lengths with respect to the first light and the second light, a third backlight including a third output coupler, the third backlight being configured to output third light of a third wavelength through the third output coupler, and a third lens disposed to face the third output coupler and having different focal lengths with respect to the first light, the second light, and the third light.

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.

Systems, devices, and methods for side lobe control in holograms are described. The magnitude of the side lobes of a hologram depends on the distribution of refractive index modulation (Δn), therefore control of side lobe magnitude may be achieved by controlling the distribution of Δn. The distribution of Δn may be controlled by replicating a hologram from a master with two reference beams, where the wavelength and angle of each reference beam, the playback angle of the master hologram, and the thickness of the master hologram, the copy holographic recording medium (HRM), and the recording substrate are carefully chosen to achieve a pattern of meta-interference within the HRM that matches the desired distribution of Δn.

A hologram for an illumination device for vehicles and a corresponding illumination device are provided. The hologram has a plurality of holographic structures designed for a respectively associated wavelength, wherein the holographic structures have diffraction properties that are identical among one another.

In a microscopic observation unit (10), hologram data is acquired at each measurement position on a cell culture plate (13) while a light-source section (11) and other related sections are gradually moved by a moving section (15). Every time a set of data for one measurement position is acquired, a measurement monitoring image creator (24) creates a thumbnail image by reducing the size of a hologram image which is based on original data (two-dimensional distribution of light intensity). A display processor (25) pastes the create thumbnail image to progressively complete the hologram image of the entire plate to be displayed on a display unit (27). A measurement operator watches the hologram image during the execution of the measurement. When it has been concluded that the ongoing measurement is inappropriate, the operator presses a measurement stop button to immediately discontinue the measurement. Thus, When there is a problem with the measurement, such as a foreign object mixed in the sample, the measurement can be discontinued before a phase image or intensity image based on the hologram data is reconstructed on the server after the completion of the entire measurement, so as to avoid wasting time for the useless measurement.

A holographic three-dimensional multi-spot light stimulation device is provided with: a three-dimensional imaging holographic optical system A which employs fluorescent exciting light to acquire three-dimensional fluorescence distribution information resulting from fluorescent signal light from a plurality of stimulation target objects; and a three-dimensional light stimulation holographic optical system B which employs a light stimulation hologram generated on the basis of the acquired three-dimensional fluorescence distribution information to form a plurality of light spots in space, to impart stimulation simultaneously to the plurality of stimulation target objects. Furthermore, the three-dimensional light stimulation holographic optical system B is provided with a spatial light phase modulating element 22 and a control unit 25, wherein the control unit 25 generates the light stimulation hologram by controlling the spatial light phase modulating element 22 on the basis of the three-dimensional fluorescence distribution information.

An integrated three-dimensional display includes a recording surface which includes a calculated element region in which phase components of light from light converging points of a holographic reconstructed image are calculated, and a phase angle recorded area for recording a phase angle calculated based on the phase components. The phase angle recorded area includes a plurality of monochromatic regions having a uneven structure surface. The phase angle is recorded in an overlap area in which the calculated element region and the phase angle recorded area overlap each other. Light converges on the light converging points at specific distances from the recording surface, the specific distances being determined for the respective light converging points even when light reflected from the plurality of monochromatic regions converges.

A method of producing information from at least one camera image of an object, including: A) recording raw image data of the at least one camera image, B) evaluating the raw image data by a mathematical linkage to produce combination image data, C) deriving the information from the combination image data, D) outputting the information, E) determining an actual measure for a data quality of the raw image data prior to or after evaluation steps in step B), F) determining a deviation between the actual measure for the data quality and a target measure for the data quality of the raw image data of at least one camera image, and G) again recording all raw image data of those camera images, for which the deviation determined in step F) is greater than a predetermined threshold value and repeating at least one evaluation step from step B) and steps C) to F) either until the deviation determined in step F) for the raw image data of all camera images from the plurality of camera images is less than the threshold value or until a predetermined termination condition is fulfilled.

The present disclosure provides a method and apparatus for generating a full-color holographic image. The method of generating a full-color holographic image includes forming images for each color channel based on complex hologram data extracted from rays propagating from a target object, and combining the formed images into one color image, wherein the images for each color channel are formed at reconstruction points for each color channel derived based on the complex hologram data.

A head-mounted electronic device may include a display with an optical combiner. The combiner may include a waveguide with first and second output couplers. The first output coupler may couple a first portion of image light at visible wavelengths out of the waveguide and towards an eye box. The second output coupler may couple a second portion of the image light at near-infrared wavelengths out of the waveguide and towards the surrounding environment. The second portion of the image light may include an authentication code that is used by a secondary device to authenticate the head-mounted device and/or may include a pattern that serves to prevent camera equipment in the surrounding environment from capturing accurate facial recognition information from a user while wearing the head-mounted device.