Abstract:
A method for displaying an image viewable by an eye, the image being projected from a portable head worn display, comprises steps of: emitting a plurality of light beams of wavelengths that differ amongst the light beams; directing the plurality of light beams to a scanning mirror; modulating in intensity each one of the plurality of light beams in accordance with intensity information provided from the image, whereby the intensity is representative of a pixel value within the image; scanning the plurality of light beams in two distinct axes with the scanning mirror to form the image; and redirecting the plurality of light beams to the eye using a holographic optical element acting as a reflector of the light beams, whereby the redirecting is dependent on the wavelength of the light beam, to create for each light beam an exit pupil at the eye that is spatially separated from the exit pupils of the other light beams.
Abstract:
Methods and apparatus (1100) for trapping fluid-borne object (s) (212) using one or more Fresnel zone plates (202) located in proximity to a fluid medium (208). Optical tweezers based on one or more Fresnel zone plates may be integrated with a microfluidic structure (e.g., chambers, channels) (1104) of various geometries so as to form one or more optical traps (215) within a fluid medium contained by the microfluidic structure (s). Three-dimensional trapping of objects can be obtained with stiffness comparable to that of conventional optical tweezers based on a microscope objective. In one example, a single Fresnel zone plate is particularly configured to form multiple optical traps upon irradiation, so as to trap multiple objects simultaneously. Exemplary applications of the methods and apparatus disclosed herein include determination of various fluid medium properties (e.g., velocity, refractive index, viscosity, temperature, pH) and object sorting.
Abstract:
Methods and apparatus (200, 400) for trapping fluid-borne object(s) (212) using one or more Fresnel zone plates (202) located in proximity to a fluid medium (208). Optical tweezers based on one or more Fresnel zone plates may be integrated with a microfluidic structure (e.g., chambers, channels) (1104) of various geometries so as to form one or more optical traps (215) within a fluid medium contained by the microfluidic structure(s). Three-dimensional trapping of objects can be obtained with stiffness comparable to that of conventional optical tweezers based on a microscope objective. In one example, a single Fresnel zone plate (1500, 1600) is particularly configured to form multiple optical traps upon irradiation, so as to trap multiple objects simultaneously. Exemplary applications of the methods and apparatus disclosed herein include determination of various fluid medium properties (e.g., velocity, refractive index, viscosity, temperature, pH) and object sorting.
Abstract:
A holographic optical device (2) includes a light-transmissive substrate (2a), a first holographic optical element (Hs), and a second holographic optical element (Hr) that is laterally disposed on the substrate from the first holographic optical element. At least one of the holographic optical elements is a complex diffraction grating that can handle a multiplicity of plane and/or spherical waves arriving from a range of angles, and having a range of wavelengths. Applications for the device include a wavelength division multiplexer/demultiplexer, an image reconstructor, a beam expander/compressor, and a visor/head-up display.
Abstract:
A method of laser processing of an object (5) by subjecting its surface to laser radiation beams (1) directed on the processed areas (2) of a desired configuration, where three-dimensional phase modulation of the laser radiation beams (1) is effected depending on the desired configuration of the processed area (2) and on a predetermined distribution of the intensity, with simultaneous rotation. A device for implementation of the method comprises a laser radiation source (8) on the optical axis of which is located an optical system (12) intended to deliver the laser radiation to the object (5) and including at least one computer optics phase element (COE) (3) shaped as a reflecting or transparent plate with a microrelief surface structure dependent on the configuration of the processed area (2), on the distribution of laser radiation intensity and its wave-length (lambda), the protrusions (14) of the relief being of a height (h) changing in the direction from the base (a) to the top (b) within a range of values from 0 to lambda/2 for the reflecting plate and from 0 to lambda(n-1) for the transparent plate, where n is the refractive index.
Abstract:
There is provided a security document or device (95) comprising a substantially transparent or translucent material (60), an array of micro image elements (91a, 91b) provided on one side (62) of the transparent or translucent material (60), and a diffractive lens array (92) including a plurality of linear diffractive zone plate (DZP) elements provided on the opposite side (61) of the substantially transparent or translucent material (60). The linear DZP elements form diffractive lenses each arranged to focus incident radiation (98) onto a micro image element of the array of micro image elements to produce a magnified image. The individual DZP elements have at least one characteristic, such as focal length or off-axis distance, modulated with respect to an adjacent DZP element.
Abstract:
A holographic substrate-guided wave-based see-through display can has a microdisplay, capable of emitting light in the form of an image. The microdisplay directs its output to a holographic lens, capable of accepting the light in the form of an image from the microdisplay, and capable of transmitting the accepted light in the form of an image. The holographic lens couples its output to an elongate transparent substrate, capable of accepting the light in the form of an image from the holographic lens at a first location, and transmitting the light in the form of an image along a length of the substrate by total internal reflection to a second location spaced from the first location, the elongate substrate being capable of transmitting the accepted light in the form of an image at the second location. The substrate couples out what it receives to a transparent holographic grating, capable of accepting the light transmitted from the elongate substrate and transmitting it to a location outside of the holographic grating as a viewable image.
Abstract:
The invention relates to a wall-opening apparatus that comprises a diversion means for diverting the light flowing therethrough, and a light-energy conversion material that intensifies the light in the visible spectrum.
Abstract:
An objective lens module suitable for size reduction and adapted for recording/reproducing information on/from on optical disk of different compatible wavelength or on/from a recording surface. The objective lens module comprises a focusing lens disposed in alignment with the optical path of a first laser beam of a first wavelength and a transmission diffraction optical element disposed in alignment to direct the diffracted light of the first laser beam to the focusing lens. The diffraction optical element has an entrance surface, an exit surface, and first to third regions composed of diffraction gratings of different diffractive angles of diffraction and provided around the optical axis of at least one of the entrance and exit surfaces and defined by the radial distances in order from the optical axis. The first region diffracts the odd-order diffracted light of the first laser beam to the focusing lens, the second region diffracts the even-order diffracted lights of the first laser beam to the focusing lens, and the third region diffracts the even- or zero order diffracted light of the first laser beam to the focusing lens. The focusing lens focuses the diffracted lights from the first to third regions with a predetermined numerical aperture.