An embodiment of the present disclosure provides a holographic optical element and a manufacturing method of a holographic optical element including holographic gratings, the manufacturing method including: a step (a) of forming a photosensitive substrate by coating one surface of a substrate with a photosensitive resin; and a step (b) of recording the holographic gratings by irradiating each of one surface and the other surface of the photosensitive substrate with laser light, wherein in the step (a), the photosensitive resin is applied so that a height of a photosensitive resin coating layer varies along a predetermined direction.

The holographic Christmas tree is a holographic device. The holographic Christmas tree projects a three-dimensional image of a Christmas tree. The holographic Christmas tree includes a pedestal, a holographic projector, a substrate, and an image. The image is the three-dimensional image of a Christmas tree. The holographic substrate projects the image into the substrate. The pedestal contains the holographic projector.

To provide a hologram recording composition capable of further improving diffraction characteristics.

The present technology provides a hologram recording composition containing at least a radically polymerizable monomer, a matrix resin, a photopolymerization initiator, and an anthracene-based compound. The present technology also provides a hologram recording medium including a photocurable resin layer containing at least a radically polymerizable monomer, a matrix resin, a photopolymerization initiator, and an anthracene-based compound. Furthermore, the present technology also provides a hologram using the hologram recording medium. Moreover, the present technology also provides an optical device and an optical component using the hologram.

To provide a hologram recording composition capable of further improving diffraction characteristics and the transparency of a hologram.

The present technology provides a hologram recording composition containing at least a chromic dye whose decolorized body has a structure containing a primary and/or secondary amino group, an epoxy monomer, and a polymerization initiator. The present technology also provides a hologram recording medium including a photosensitive layer containing at least a chromic dye whose decolorized body has a structure containing a primary and/or secondary amino group, an epoxy monomer, and a polymerization initiator. Furthermore, the present technology also provides a hologram optical element using the hologram recording medium. Moreover, the present technology also provides an optical device and an optical component using the hologram optical element. The present technology also provides a method for forming a hologram diffraction grating, the method including causing the hologram recording medium to react selectively by an electromagnetic beam having a spatially modulated amplitude.

There is provided a holographic security element including a substrate; and an array of nano-reflectors configured to form a pattern on the substrate and to generate a holographic image corresponding to the pattern at a predetermined distance from the substrate when irradiated with a predetermined light source. In particular, the array of nano-reflectors is configured to generate the holographic image at the predetermined distance to have a size that is larger than a size of the pattern. There is also provided a method of forming the holographic security element, and an article having one or more holographic security elements incorporated therein.

A metamaterial optical filter including: a transparent substrate; and a photosensitive polymer layer provided to the transparent substrate, wherein the photosensitive polymer layer is treated using a laser to form a non-conformal holographically patterned subwavelength grating, the holographic grating configured to block a predetermined wavelength of electromagnetic radiation. A system and method for manufacturing holographically patterned subwavelength grating onto the photosensitive polymer layer including: applying a photosensitive polymer layer to a transparent substrate; placing the photosensitive polymer layer between a laser and a mirror; scanning the laser over the photosensitive polymer layer such that a holographic grating is created within the photosensitive polymer layer by interaction between the laser light and light reflected from the mirror; and stacking two or more holographically patterned subwavelength grating layers to form complex metamaterial optical filter stacks.

The present disclosure discloses a method and apparatus for preparing a femtosecond optical filament interference direct writing volume grating/chirped volume grating. The method is characterized in that optical filaments are formed in glass by using femtosecond pulse laser, and plasma is controlled to quickly scan in the glass and etch a volume grating or chirped volume grating structure by adjusting the focal length of convex lens, laser energy and movement of motor machine. The apparatus includes a femtosecond pulse laser module, a pulse chirp management module, a pulse time domain shaping module, a laser separation and interference module, a glass volume grating processing platform module and a camera online imaging module.

Methods and apparatus to calibrate spatial light modulators are disclosed. Examples include processor circuitry to execute and/or instantiate instructions to provide a greyscale image to a spatial light modulator (SLM) to define voltages to be applied to individual pixels of the SLM. The voltages associated with pixel values in the greyscale image. The pixel values arranged in a double-slit grating pattern. The SLM to produce an interference pattern based on the double-slit grating pattern. The processor circuitry is to determine a phase difference between first and second gratings of the double-slit grating pattern based on the interference pattern. The processor circuitry is to generate a phase curvature based on the phase difference.

The present invention, in one aspect, relates to monomers and photopolymers that exhibit a high refractive index. The photopolymers of the invention have properties suitable for fabricating holographic optical elements (HOEs).

An illumination system is arranged to output a light beam for illuminating a scene. The system comprises a spatial light modulator arranged to receive incident light, and to output light comprising a first component and a second component. The first component comprises incident light that is output without modulation by the spatial light modulator. The second component comprises incident light that is spatially-modulated according to a hologram and output by the spatial light modulator. A control device is operable to control the proportion of light output by the spatial light modulator that corresponds to the second component.