Abstract: A transaction card is provided comprising a card body comprising a metallic material, the card body including a primary surface, a secondary surface, an aperture and a slit, wherein the primary surface and the secondary surface are coated with a diamond like carbon (DLC) coating.

Abstract: A volumetric imaging apparatus is energizable to form an image onto a display surface as an input to a monocentric catadioptric imaging apparatus having a light path for image-bearing light from the display surface, wherein the light path extends substantially symmetrically to a vertical plane that extends through a curved relay mirror and a curved primary mirror. The monocentric catadioptric imaging apparatus has reflective surfaces to fold the light path between the curved relay mirror and the curved primary mirror to condition the distribution of the image-bearing light in a horizontal direction. The light path of the monocentric catadioptric imaging apparatus directs light from the curved primary mirror toward a light input surface of a vertical pupil expander that has a light exit surface that is substantially orthogonal to the vertical plane. The light exit surface directs light through a free-form corrector for convergence and toward a windshield for display.

Abstract: The invention taught herein provides a method, device and system for modulating or switching electromagnetic radiation by controlling a state of the radiation, such as a polarization state. Radiation is directed at a reflective or transmissive structure, such that the radiation is incident on the structure. The structure includes a property that can be dynamically switched between two configurations, one of which is asymmetric and is configured to modify the polarization characteristic of the radiation. The dynamically configurable structure can be combined with polarization components to achieve modulation. Embodiments suitable for mode-locking a laser and for cavity dumping a mode-locked laser are also disclosed.

Abstract: According to various embodiments, an optoelectronic component may be provided, the optoelectronic component including: an electrode structure disposed at least one of over and in a carrier; and a grating structure disposed over the electrode structure, the grating structure including at least a first region and a second region, wherein the first region of the grating structure includes amorphous silicon; and wherein the second region of the grating structure includes a material having a refractive index different from the refractive index of the amorphous silicon.

Abstract: An exposure apparatus comprises a light source (1) and a diffusing sheet (2) provided below the light source (1), a side of the diffusing sheet (2) adjacent to the light source (1) is an incident face (21) and the other side opposite to the incident face (21) is an emitting face (22); the light emitted from the light source (1) enters the diffusing sheet (2) through the incident face (21), is refracted within the diffusing sheet (2), and after being diffused, emits out evenly throughout the emitting face (22). The exposure apparatus enables an evenly exposure of the photoresist on the substrate. An exposure method using such an exposure apparatus is also disclosed.

Abstract: The present invention provides a projection display (10) for projecting a color image to a viewer (12) overlaid on a real world scene viewed through the display. The display comprises an image generator (16) for generating image bearing chromatic light for injection into a waveguide assembly (28) at a first range of field angles (44) and a second range of field angles (46). The waveguide assembly comprises a first waveguide (30) having a first input diffraction region (32) arranged to couple image bearing chromatic light in the first range of field angles into the first waveguide to propagate by total internal reflection; and a second waveguide (40) having a second input diffraction region (42) arranged to couple image bearing chromatic light in the second range of field angles into the second waveguide to propagate by total internal reflection.

Abstract: An exposure apparatus can mitigate the impact of fluctuations in the refractive index of ambient gas, and improve, for example, stage positioning accuracy. An exposure apparatus radiates an exposure illumination light to a wafer on a wafer stage through a projection optical system, and forms a prescribed pattern on the wafer, and comprises: a scale, which is provided to the wafer stage; a plurality of X heads, which detect information related to the position of the scale; a measurement frame that integrally supports the plurality of X heads and has a coefficient of linear thermal expansion that is smaller than that of the main body of the wafer stage (portions excepting a plate wherein the scale is formed); and a control apparatus that derives information related to the displacement of the wafer stage based on the detection results of the plurality of X heads.

Abstract: An optical amplifier system includes a diode pump array including a plurality of semiconductor diode laser bars disposed in an array configuration and characterized by a periodic distance between adjacent semiconductor diode laser bars. The periodic distance is measured in a first direction perpendicular to each of the plurality of semiconductor diode laser bars. The diode pump array provides a pump output propagating along an optical path and characterized by a first intensity profile measured as a function of the first direction and having a variation greater than 10%. The optical amplifier system also includes a diffractive optic disposed along the optical path. The diffractive optic includes a photo-thermo-refractive glass member. The optical amplifier system further includes an amplifier slab having an input face and position along the optical path and separated from the diffractive optic by a predetermined distance.

Abstract: An illumination system of a micro-lithographic projection exposure apparatus is provided, which is configured to illuminate a mask positioned in a mask plane. The system includes a pupil shaping optical subsystem and illuminator optics that illuminate a beam deflecting component. For determining a property of the beam deflecting component, an intensity distribution in a system pupil surface of the illumination system is determined. Then the property of the beam deflecting component is determined such that the intensity distribution produced by the pupil shaping subsystem in the system pupil surface approximates the intensity distribution determined before. At least one of the following aberrations are taken into account in this determination: (i) an aberration produced by the illuminator optics; (ii) an aberration produced by the pupil shaping optical subsystem; (iii) an aberration produced by an optical element arranged between the system pupil surface and the mask plane.

Abstract: A shape measurement data is acquired by measuring along a spiral measurement path a lens shape which is machined along a spiral machining path. An interpolated shape measurement data at intersecting points of a radial line passing through a center of the lens shape and the spiral measurement path is acquired by interpolating the shape measurement data, and a compensated machining amount for removing a machining error at each of the intersecting points (the machining points) is calculated from the interpolated shape measurement data by interpolation. Further, a machining point compensated machining amount at each of the machining points on the spiral machining path is calculated from the calculated compensated machining amount, and a compensated machining path is created on the basis of the machining point compensated machining amount.

Abstract: A device for checking a secured object provided with at least one security element for generating sequential or dynamic optical effects according to the orientation thereof and/or the movements applied thereto, has a display screen, a position and/or motion sensor and a device for generating and displaying on the screen a simulation of the nominal security element associated with the secured object, the display depending on the orientation of the device as determined by the position and/or motion sensor, so as to be able to compare the security element of the object to be checked and the simulation according to the respective orientations or movements thereof. A method for checking the secured object is by means of such a device.

Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest to the object side and having a negative refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components respectively made from different optical materials and which has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components. The third lens group includes at least one achromatic lens component having a negative refractive power, and a lens surface of the third lens group nearest to the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: Disclosed are a liquid crystal display device having touch and three-dimensional display functions and a method for manufacturing the same. The liquid crystal display device includes a touch and three-dimensional image display panel adhered to a liquid crystal panel through an adhesive layer, wherein the touch and three-dimensional image display panel includes a lower substrate provided with first and second electrodes for realizing a three-dimensional image, a upper substrate provided with third and fourth electrodes for sensing touch and a common electrode for realizing the three-dimensional image, and a liquid crystal display filled between the upper and lower substrates.

Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest the object side and having a negative refractive power and at least one cemented lens component having a combined positive refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components made from different optical materials and has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component. The third lens group includes at least one achromatic lens component having a combined negative refractive power, and a lens surface of the third lens group nearest the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: In one aspect, optical devices and components are described herein. In some embodiments, a device comprises a substrate and a grating layer disposed on the substrate, wherein the grating layer comprises a periodic grating structure and a sublayer beneath the grating structure and adjacent the substrate. In some cases, the sublayer has a small thickness compared to the wavelength of light incident on and/or coupled into the device. For example, the sublayer of a device described herein can have a thickness of less than about 200 nm. Moreover, devices and components described herein can exhibit both guided-mode resonance (GMR) effects and a Rayleigh anomaly and can be used to provide various optical components such as optical couplers, substrate wave couplers, and flat-top angular reflectors or flat-top angular filters.

Abstract: A wavelength selective switch for selectively switching optical wavelength components of an optical signal uses both LCoS and MEMs switching technologies to improve device performance. Specific performance improvements may include more ports, better spectral performance and isolation, improved dynamic crosstalk, more flexible attenuation options, integrated channel monitoring and compressed switch heights.

Abstract: Provided is a microscope optical system in which the occurrence of flare due to unnecessary-order diffracted light exited from a diffractive optical element is suppressed. A microscope objective lens MS is configured by including an objective lens OL which has a diffractive optical element GD and converts light from an object into a substantially parallel light flux, and a second objective lens IL which forms an image of the object by focusing the substantially parallel light flux from the objective lens OL, and is configured such that, in case where an m-th order of diffracted light from the diffractive optical element GD is used for the image formation, the following expression is satisfied: |?|>tan?1(0.06/D) when the light of a maximum NA emitted from the object located on an optical axis enters the diffractive optical element.

Abstract: A diffractive optical element includes: a first diffractive element in which a plurality of basic units are two-dimensionally arranged; and a second diffractive element in which a plurality of basic units are two-dimensionally arranged, wherein when a direction in which the basic units are arranged in the first diffractive element is a first direction, a direction in which the basic units are arranged in the second diffractive element is a second direction, an angle ? between the first direction and the second direction is such that ?|?1|<?<|?1|, and ??0, sin ?1=??/?x where a closest distance of zero-order light generated when the diffracted light generated by the first diffractive element is further incident on the second diffractive element is ?x and a closest distance of the diffracted light and stray light generated by the second diffractive element is ?.

Abstract: A hollow-structure metal grating is provided. The hollow-structure metal grating includes a substrate, a number of connecting metal layers, and a number of hollow metal protrusions spaced and located on a surface of the substrate. A space is defined between each of the number of hollow metal protrusions and the substrate.

Abstract: A single longitudinal mode laser in the present invention is described with an external high resolution filter to select a single longitudinal mode as the laser output from a multiple longitudinal mode microchip laser. The high resolution filter comprises at least one grating and a plurality of optical components to disperse the multiple longitudinal modes of the microchip laser and select a single longitudinal mode. The high resolution filter may have a single, double, triple, or quadruple-pass structure, which causes the laser beam to be diffracted by the grating once, twice, three, or four times, respectively, for increased resolution. The grating is configured to have a diffraction angle at the up-limit of 80 to 90 degrees for the single pass structure and to have the near up-limit diffraction angle of 73 to 90 degrees for the double, triple, and quadruple-pass structure.

Abstract: A display includes light-scattering regions. Each of the light-scattering regions is provided with linear protrusions and/or recesses having the same longitudinal direction. The light-scattering regions are different from each other in the longitudinal direction.

Abstract: A spectral instrument including a light source configured to produce a light beam, the light beam comprising a plurality of wavelengths, and the light beam being about collimated or pseudo-collimated. The spectral instrument also includes a spectral dispersion device in optical communication with the light source. The spectral instrument also includes a screen disposed in the optical path after the spectral dispersion device. The screen comprises a material configured to be substantially opaque to at least some of the plurality of wavelengths. The screen is sized and dimensioned to at least partially block selected ones of the plurality of wavelengths. The screen is movable with respect to an axis of the screen. The spectral instrument also includes an imaging lens disposed in the optical path and disposed either after the screen or before the screen.

Abstract: A microscope objective lens OL includes, in order from the object side: a first lens group G1 having a positive refractive power, a second lens group G2, and a third lens group G3 having a negative refractive power, wherein the first lens group G1 includes a positive lens component L1 having a lens surface with a negative refractive power and at least one cemented lens component CL11 having a positive refractive power, the second lens group G2 includes a diffractive optical element GD that joins two diffractive element components L6 and L7 respectively made from different optical materials and which has a diffractive optical surface D on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component CL21, and the third lens group G3 includes at least one achromatic lens component CL31.

Abstract: A higher forgery prevention effect is realized. A display includes a first interface section provided with a relief-type diffraction grating constituted by a plurality of grooves, and a second interface section provided with a plurality of recesses or projections arranged two-dimensionally at a center-to-center distance smaller than the minimum center-to-center distance of the plural grooves, and each having a forward tapered shape.

Abstract: A photon collimator, suitable for use in medical imaging equipment, is constructed from a block of photon-attenuating material, such as solid tungsten or molybdenum alloy that defines a plurality of integrally formed septa slats. Each slat has an elongated length dimension greater than thickness and depth dimensions, and is oriented in an opposed pattern array that is laterally spaced relative to its respective thickness dimension. An aperture channel is defined between each pair of opposed slats. Rows of integrally formed slats in one block or separately affixed blocks may be stacked on each other at skewed angles to form two-dimensional grids of apertures having polygonal cross sections. The slats may be formed by electric discharge or laser thermal ablation machining, such as by a sequential passing of an EDM wire cutting head along the pattern array, repeating sequential cutting of respective channel depth and width.

Abstract: An optical component includes a substrate and two optical lenses, and the substrate and the two optical lenses are an integrated and inseparable structure. A groove that can accommodate a required collimating optical element is provided on the substrate, or a collimating optical element and the substrate are integrated. Because fabrication of optical elements is completed during fabrication of the optical component, the number of elements to fabricate and time and cost of fabricating the elements can be reduced. Also, during assembly of an image capturing device, it is only required that the optical component is locked to a body of the image capturing device to complete arrangement of a front panel and the optical elements, which can greatly simplify an assembly procedure and shorten assembly time.

Abstract: A single-pump multi-wavelength lasing semiconductor Raman pump laser comprises a thermoelectric cooler arranged in a shell; a heat transition bearing platform arranged in the thermoelectric cooler; a semiconductor Raman pump laser tube core arranged on the heat transition bearing platform; and a coupling lens group , a thermistor and a backlight detector that are arranged on the heat transition bearing platform respectively. The pump laser tube core, the backlight detector, the thermistor and the thermoelectric cooler are electrically connected to pins outside a laser tube shell. A pump combination apparatus comprises a first signal transmission fiber, a pump signal combiner and a second signal transmission fiber that are sequentially connected to each other. An input terminal of the pump signal combiner is connected to an output terminal of an isolated polarization beam combiner and depolarizer.

Abstract: The present invention has an object of providing a diffraction grating excellent in surface precision and allowing its miniaturization and weight reduction and a method for manufacturing the same. The present invention comprises: a glass substrate having a thickness of 0.5 mm to 8 mm; a resin-made microstructure body having an unevenness pattern and formed on one surface of the glass substrate; and a flat resin layer formed on the other surface of the glass substrate. Even if the glass substrate has surface precision of ?/2 or greater, the replica of the diffraction grating, in which the microstructure body is not influenced by the surface precision of the glass substrate and which is excellent in surface precision, can be manufactured by the flatness of the resin layer. In addition, since the glass substrate can be made thin, the miniaturization and weight reduction of the diffraction grating can be achieved.

Abstract: A planar optical system for wide field-of-view polychromatic imaging includes a planar waveguide including two plane parallel faces, an entry coupler including a first diffraction grating, and an exit coupler including a second diffraction grating. The diffraction gratings are low line density diffraction gratings that have a pitch greater than the wavelength of use such that the grating is adapted to couple an entry beam having a mean angle of incidence i0 ranging between 30 to 60 degrees into the waveguide by positive first order (+1) diffraction, the coupled beam defining an internal angle of incidence greater than the angle of total internal reflection and less than ?=80 degrees, and the second grating is adapted to receive the coupled beam and to diffract it out of the waveguide by negative first order (?1) diffraction at a mean exit angle i1 ranging between 30 to 60 degrees.

Abstract: To provide a structural color body that exhibits color using physical phenomena such as reflection, interference, diffraction, and scattering of light, and in which the decorative effect can be further enhanced, the present invention configures a structural color body by combining a plurality of structural color portions that structurally exhibit different colors from each other.

Abstract: A method of producing a diffractive optical element includes forming on a textured surface of a first substrate (2) a predetermined pattern of an ink (3) including an activator for a metallization reaction and one or more binders; causing or allowing the binder to solidify; applying a first adhesive layer (4) on top on the solidified binder and activator; securing a second substrate (5) to the adhesive layer; removing the second substrate with adhered solidified binder and activator from the first substrate; and forming a metal coating (10) onto the activator-containing regions adhered to the second substrate.

Abstract: A high-transparency, low-emissivity window film or coating is designed to maximize so-called greenhouse heating. This effect is achieved through the use of conductive grids and/or gratings whose width and spacing has been selected such that the grid appears as a uniform conductive film to long-wavelength infrared (blackbody) radiation. The conductive grid film reflects the blackbody radiation strongly, and such that the grid appears highly transparent to visible and near-infrared light, and therefore transmits it.

Abstract: A Head Up Display can be utilized to find light from an energy source. The Head Up Display includes a first waveguide having a first input coupler and a first output coupler. The Head Up Display can also include a second waveguide having a second input coupler and a second output coupler. The first waveguide has a first major surface and the second waveguide has a second major surface, which are disposed approximately parallel to each other. The first waveguide and the second waveguide are positioned as a combiner and allowing viewing an outside feed and information from an image source. The first input coupler diffracts light in the first field of view into the first waveguide and light in a second field of view reaches the second input coupler and is diffracted into the second waveguide.

Abstract: A grating sheet, a LCD device and methods for manufacturing the grating sheet and a liquid crystal display panel are provided. The grating sheet comprises a plurality of primary color gratings in parallel, each of which comprises a red R sub-grating, a green G sub-grating and a blue B sub-grating in parallel, and each sub-grating comprises an opening area and a reflective region disposed around the opening area and corresponds to a pixel unit on a sub-array substrate. The grating sheet, the liquid crystal display panel and methods for manufacturing the grating sheet and a liquid crystal display panel may be applicable to a system with a liquid crystal display.

Abstract: Described herein is a diffraction grating (1) for use in an optical system. The diffraction grating includes a substrate (2) and an array of elongate diffracting elements (3) arranged in a grating profile across the substrate. The grating profile imparts a predefined phase change to optical beams to at least partially correct the beams for optical aberrations present in the optical system.

Abstract: Optical components and systems comprising combined optical filters and diffraction gratings are generally described. In certain embodiments, an optical filter is in contact with a diffraction grating. In certain embodiments, the optical filter and the diffraction grating can be used to diffract and direct a first portion of electromagnetic radiation incident upon the grating and filter toward a receiver while filtering a second portion of the electromagnetic radiation incident upon the grating and filter.

Abstract: Optical components and systems comprising combined optical filters and diffraction gratings are generally described. In certain embodiments, an optical filter is in contact with a diffraction grating. In certain embodiments, the optical filter and the diffraction grating can be used to diffract and direct a first portion of electromagnetic radiation incident upon the grating and filter toward a receiver while filtering a second portion of the electromagnetic radiation incident upon the grating and filter.

Abstract: A diffractive device for fitting to a façade of a building, or to any other reflective wall, exposed to electromagnetic radiation emitted by a source located at a distance from the building, the device including a plurality of tubular resonant elements arranged on the façade of the building, where the resonant elements are arranged in a substantially parallel manner on the façade of the building in such a way as to form a diffraction grating and are oriented in a substantially perpendicular direction to the plane defined by the propagation vectors of the incident and reflected electromagnetic waves, each resonant element being configured to form an LC resonator capable of re-radiating a wave corresponding to the incident wave affected by a phase shift; the set of resonant elements being arranged in such a way that the incident wave is diffracted in a preferential direction.

Abstract: An optical de-multiplexer (de-MUX) that includes an optical device that images and diffracts an optical signal using a reflective geometry is described, where a free spectral range (FSR) of the optical device associated with a given diffraction order abuts FSRs associated with adjacent diffraction orders. Moreover, the channel spacings within diffraction orders and between adjacent diffraction orders are equal to the predefined channel spacing associated with the optical signal. As a consequence, the optical device has a comb-filter output spectrum, which reduces a tuning energy of the optical device by eliminating spectral gaps between diffraction orders of the optical device.

Abstract: A method and apparatus for increasing duality modulation of electromagnetic radiation beyond levels achievable by individual duality modulation generators where duality modulation imparts to radiation a disproportion of irradiance and wave intensity. Various techniques are disclosed for configuring a multiplicity of individual duality modulation generators in a cascade such that initially input radiation acquires cumulative increments of duality modulation upon traversing the cascade of individual generators.

Abstract: Apparatus 110 and methods for the coherent beam combining of three beams 101, 102, 103 from laser sources. In one embodiment, a two-beam coherent combiner 27 comprises two laser sources 1, 2, a repeated pattern optical element 22 that functions as a two port diffractive beam combining element, and a method for adjusting the relative phase difference between the two beams to improve the combined beam 23 output. In another embodiment, a three-beam coherent beam combiner 110 comprises three laser sources 101, 102, 103, a repeated pattern optical element 111 that functions as a three port diffractive beam combining element, and a method for adjusting the relative phase difference between the three beams to improve the combined beam 123 output. The apparatus 27, 110 and methods disclosed can be used in external cavity laser configurations 200, 300 to combine two or three laser resonator gain paths into phased paths for improved single wavelength combined beam performance.

Abstract: A method and a terminal device for making multi-system constraint of a specified permission in a digital rights. A rights object related to content object is obtained by an executing device. The specific permission descriptions of the rights object include system constraint descriptions of a plurality of systems of the same type. The executing device obtains a corresponding system information in the device according to the system constraint descriptions and compares the system information in the device with the system information in the system constraint descriptions, so as to judge whether there is any system permitted in system constraint descriptions. If yes, it determines to permit executing the specific permission for the content object; otherwise, it determines not to permit executing said specific permission for the content object.

Abstract: An apparatus for providing an optical display includes an optical substrate for propagating light received from a light source, a first set of one or more switchable diffractive elements in the substrate, and a second set of one or more switchable diffractive elements in the substrate. Each diffractive element in the second set corresponds to a diffractive element in the first set. Each of the diffractive elements in the first and second sets is configured to switch between on and off states. One of the states is for diffracting light and the other state for allowing light to pass through. Each of the first set of diffractive elements is configured to diffract the light at an angle for propagation in the substrate. Each of the second set of diffractive elements is configured to diffract the light for display.

Abstract: A method of producing a grating structure comprises the steps of forming a stamp from flexible plastic material, the stamp including a negative of a periodic grating pattern on a first surface; forming an ink by applying a polymer film to the stamp, the ink including a first surface and an opposing second surface, wherein the first surface of the ink contacts the first surface of the stamp such that the ink retains a positive of the periodic grating pattern; placing the ink and the stamp on a substrate such that the second surface of the ink contacts an upper surface of the substrate; and removing the stamp from the ink by applying a tensional force to one edge of the stamp.

Abstract: A method for manufacturing a diffraction grating comprises below steps. Firstly providing a substrate which having a first surface and a second surface opposite to the first surface. Then providing a first predetermined function associated with arrangement of the grooves of the first grating and a second predetermined function associated with arrangement of the grooves of the second grating. Thirdly transforming the first function into a first Fourier series and transforming the second function into a second Fourier series. Fourthly forming the first grating on the first surface of the substrate using a fast tool sever system according to the first Fourier series. Lastly forming the second grating on the second surface using the fast tool sever system according to the second Fourier series.

Abstract: Provided are an organic-inorganic composite resin composition and an organic-inorganic composite resin material made of a cured product thereof, containing at least an organic compound having a polymerizable functional group, metal oxide fine particles, and a polymerization initiator. The cured product obtained by curing the organic-inorganic composite resin composition through application of an active energy has a refractive index nd of 1.61 or more and 1.65 or less, Abbe's number ?d of 13 or more and 20 or less, and an anomalous dispersion characteristic ?g,F of 0.42 or more and 0.54 or less. Further provided is an optical element comprising a transparent substrate and the organic-inorganic composite resin material formed on the transparent substrate.

Abstract: High resolution fast tunable optical filters are described such that each filter includes a tunable single-peak narrow-bandwidth (SPNB) filter and a tunable etalon in tandem with the tunable SPNB filter, where the bandwidth of the tunable SPNB filter is less than the free spectral range (FSR) of the tunable etalon.

Abstract: Described herein are diffraction gratings and methods for the manufacture thereof. One method comprises applying a force to a substrate to strain the substrate, disposing a thin film on at least a portion of the substrate, and reducing the force applied to the substrate, thereby causing the thin film to buckle.

Abstract: By suitably correcting a secondary spectrum, a clear, bright optical image is obtained. Provided is a rigid-scope optical system including: an objective optical system; and at least one relay optical systems that are formed of positive front groups, middle groups, and back groups in this order from an entrance side and that reimage an optical image imaged at imaging planes at the entrance side onto imaging planes at an exit side, wherein axial chromatic aberration between two wavelengths is corrected by an optical system other than the diffractive optical element, and axial chromatic aberration between the two wavelengths and another wavelength is corrected by the diffractive optical element.

Abstract: A near-to-eye optical system includes an optically transmissive substrate having a see-through display region and a repeating pattern of diffraction elements. The repeating pattern of diffraction elements is disposed across the see-through display region of the optically transmissive substrate and organized into a reflective diffraction grating that bends and focuses computer generated image (“CGI”) light impingent upon the reflective diffraction grating. The see-through display region is at least partially transmissive to external ambient light impingent upon an exterior side of the optically transmissive substrate and at least partially reflective to the CGI light impingent upon an interior side of the optically transmissive substrate opposite the exterior side.