An optical sensing device configured to detect an object or features of the object is provided. The optical sensing device includes a structured light projector and a sensor. A structured light projector is configured to project a structured light to the object and includes a light source and at least one tunable liquid crystal diffractive optical element (LCDOE). The light source is configured to emit a light beam. The at least one tunable LCDOE is disposed on a path of the light beam and configured to convert the light beam into the structured light to form a structured light pattern on the object. The LCDOE is capable of controlling the structured light pattern by controlling voltage distribution to a liquid crystal layer in the LCDOE. The sensor is configured to sense a reflected light formed by the object reflecting the structured light. Besides, a structured light projector is also provided.

A light steeling system and method for diffractive steering of electromagnetic radiation such as visible light is disclosed. Embodiments of the light steering system include leaky-mode SAW modulators as light modulator devices. The SAW modulators preferably include reflective diffractive gratings. The gratings are mounted to/patterned upon an exit face that opposes an exit surface of the SAW modulator, in one example. Steering of light signals emitted from the SAW modulators in these systems can be accomplished by varying wavelength of light signals introduced to the SAW modulators, and/or by varying frequency of RF drive signals applied to the SAW modulators. In addition, light field generators that incorporate SAW modulators of the proposed light steering system within displays of the light field generators are also disclosed.

Provided are an irradiation device, a laser microscope system, an irradiation method, and a laser microscope detection method which can further widen a bandwidth of detection light as a multiplexed signal. Laser light beams are separated and enter a first AOD (24) and a second AOD (34) so that a plurality of first diffracted light beams and a plurality of second diffracted light beams with deflection angles and sizes of frequency shifts different from each other are generated. The first diffracted light beams and the second diffracted light beams are superposed by a beam splitter (19) so as to generate a plurality of interference light beams with beat frequencies different from each other. An objective lens (52) is formed by aligning a plurality of irradiation spots of interference light beam linearly in a main scanning direction and irradiates a sample (T) with the interference light beam. The irradiation spot is moved by oscillation of a scanning mirror (47a) in a sub scanning direction orthogonal to the main scanning direction. Fluorescence emitted from the sample (T) by irradiation of each interference light beam is detected by a light detection unit (13).

A device for reducing laser speckle using a micro scanner and a holographic diffuser. The micro scanner includes a first transparent optical substrate with an input surface and an output surface and a second transparent optical substrate with an input surface and an output surface and a variable refractive index medium sandwiched between the output surface of the first substrate and the input surface of the second substrate. Transparent electrodes are applied to the output surface of the first substrate and the input surface of the second substrate. The electrodes are coupled to a voltage generator. The input surface of the first substrate is optically coupled to a laser source. The input surface of the second substrate is configured as an array of prismatic elements. At least one of the input surface of the first substrate or the output surfaces of the second substrate is planar.

A light-steering optic comprises a dielectric substrate, a liquid crystal, and a series of transparent conductors. The dielectric substrate has a series of mutually parallel trenches formed therein. A wall of each trench extends up the trench to an adjacent land portion of the dielectric substrate, and the liquid crystal is arranged within each trench. An adherent electrode extends up the wall of the trench and onto a corresponding contact zone, which partly covers the land portion adjacent to that wall. The series of transparent conductors crosses over the series of parallel trenches. Each transparent conductor selectively contacts one or more of the electrodes at a corresponding one or more contact zones.

A hologram reproducing apparatus is provided that includes a display configured to display a hologram pattern and emit a write beam corresponding thereto, a relay lens disposed at a front surface of the display and comprising an array of microlenses each focusing the write beam, a spatial light modulator (SLM) disposed at a front surface of the relay lens, configured to write the hologram pattern according to the focused write beam and modulate a reproduction beam into a plurality of diffraction beams if the reproduction beam is incident, a light guide plate disposed between the relay lens and the SLM and configured to guide the reproduction beam toward the SLM, a filter disposed at a front surface of the SLM and configured to filter the plurality of diffraction beams and the write beam, and a lens configured to focus the plurality of diffraction beams filtered through the filter.

A device includes a number of grating stages having a liquid crystal layer disposed between at least two substrates, where at least one is coated with a photo-alignment layer and transparent electrodes. Each grating stage may be switchably responsive to a voltage, with grating periods of each grating stage selected such that, when the voltage is applied to a grating stage and a laser beam is passed therethrough, optical energy from the laser beam in plus and minus first orders is deflected toward sides of the grating stage and optical energy from a zero order of the laser beam is allowed to pass through the grating stage. A polarization state of the laser beam may be maintained from an input through an output. Each grating stage may include a thickness selected to achromatize the laser beam through the grating stages.

A projector includes a beam homogenizer receiving light from a light source and creating a predetermined illumination, and a spatial light modulator including grating stages to receive the predetermined illumination. Each grating stage may include a plurality of pixels where corresponding pixels in the grating stages are aligned with one another. Each of the pixels may include a liquid crystal layer disposed between two substrates, where a pixel is switchable by applying a voltage thereto, with a grating period of the pixel selected such that, when the voltage is applied to the pixel and light is passed therethrough, optical energy from the light in plus and minus first orders is deflected toward sides of the pixel and optical energy from a zero order of the light is allowed to pass through the pixel, with a polarization state of the light maintained through the pixel.

A directive colour filter and a naked-eye 3D display apparatus are provided. The directive colour filter includes a colour filter and a directive functional structure layer. The colour filter includes multiple light filtering units, and each light filtering unit includes at least three light filtering sub-units with different colours. The directive functional structure layer includes multiple structure units, and each structure unit and one light filtering unit are arranged correspondingly. Each structure unit includes at least three structure sub-units. Each structure sub-unit and one light filtering sub-unit are arranged correspondingly. Each structure sub-unit includes multiple nano diffraction gratings.

A display substrate, a display panel and a display device are provided. The display substrate includes a base, a first polarizer at one side of the base, and a light-splitting film between the first polarizer and the base. Multiple light-splitting structures are formed on a surface of the light-splitting film facing one side of the base, and the surface is divided into multiple light-splitting units, and the light-splitting structures in each light-splitting unit split light incident onto the light-splitting unit into multiple beams of light having different wavelengths and emergent directions. The display panel includes a first display substrate and a second display substrate arranged opposite to and forming a cell with the first display substrate, the first display substrate is the above display substrate. The display device includes the above display panel and a backlight source, a polarizer of the first display substrate faces the backlight source.