32 results about "Wavefront curvature" patented technology

An apparatus for measuring optical aberrations of the human eye wherein the person positions his or her eye on an optical axis of the apparatus and looks at an illuminated target on the optical axis that is visible to the eye for allowing the eye to focus on the target and establish a position of the eye. A collimating lens on the optical axis is movable along the optical axis for adjusting the apparent optical distance between the eye and the target. A light source directs a predetermined light beam along the optical axis into the eye and onto the retina of the eye as a spot of light. A lens reimages the light scattered from the light spot on the eye retina into a wavefront curvature sensor that forms two oppositely defocused images on an image detector, and a computer processes and analyzes the two defocused images for measuring the optical aberrations of the eye.

An apparatus for use in image display, of projecting a light beam onto a retina of a viewer, to thereby allow the viewer to perceive an image, is disclosed. The apparatus is constructed to include: a light emitter emitting a light beam; a scanner scanning the light beam emitted by the light emitter; an optical system receiving the light beam scanned by the scanner as an incoming light beam, and emitting the received incoming light beam as an outgoing light beam, such that, upon modulation of the light beam with respect to a traveling direction of the light beam, the outgoing light beam is directed to a pupil of the viewer; and a curvature compensator compensating a wavefront curvature of the incoming light beam.

An apparatus is disclosed for displaying to a viewer an image stereoscopically representing a three-dimensional object to be displayed. The apparatus includes: an emitter emitting light, having an intensity modulating section capable of intensity modulation for modulating an intensity of the light emitted from the emitter; a wavefront-curvature modulator capable of wavefront-curvature modulation for modulating a curvature of wavefront of the light emitted from the emitter; and a controller controlling the intensity modulation and the wavefront-curvature modulation, based on a luminance signal indicative of luminance of the image, and a depth signal indicative of depth of the image. The depth signal is a signal corresponding to depth data produced in a rendering process for the object to be displayed.

Method and systems are presented for analysing a wavefront using a spectral wavefront analyser to extract optical phase and spectral information at a two dimensional array of sampling points across the wavefront, wherein the relative phase information between the sampling points is maintained. Methods and systems are also presented for measuring an eye by reflecting a wavefront of an eye and measuring the wavefront at a plurality of angles to provide a map of the off-axis relative wavefront curvature and aberration of the eye. The phase accuracy between wavelengths and sample points over a beam aperture offered by these methods and systems have a number of ocular applications including corneal and anterior eye tomography, high resolution retinal imaging, and wavefront analysis as a function of probe beam incident angle for determining myopia progression and for designing and testing lenses for correcting myopia.

A method and an apparatus for recording optical gratings in a photosensitive medium are provided. The invention uses a phase mask in combination with a scanning of the recording light beam. The phase mask, or alternatively the photosensitive medium, is translated along a direction parallel to the scanning of the light beam, so that the period of the recorded grating may be locally adjusted. To ensure a proper recording efficiency over a large range, an appropriately selected wavefront curvature is provided in the light beam. The method of the invention is particularly advantageous for the recording of superimposed grating components in a photosensitive medium.

A system, for determining characteristics of a beam wavefront and reshaping such wavefront, including: apparatus for sampling the wavefront curvature and generating outputs; apparatus for reshaping the wavefront; and apparatus for receiving the outputs, proportioning the outputs to match the inputs need to drive controls for the reshaping apparatus, and sending the proportioned outputs to the reshaping apparatus. The reshaping apparatus is, preferably, a deformable mirror. The sampling apparatus includes a distorted grating. The method includes: positioning the sampling apparatus in the bean path; positioning a reshaping apparatus in the beam path; sampling the curvature of the wavefront and generating outputs representative of the curvature thereof; sending the generated outputs to the proportioning apparatus; proportioning the outputs to match the inputs needed to drive the controls of the reshaping apparatus; and sending the proportioned outputs to the reshaping apparatus to change the shape thereof.

The invention discloses a spherical wavefront curvature radius measuring device which comprises an initial wavefront adjusting module, a spherical wave generating module and a radial shearing interference module. The spherical wave generation module comprises a transmission-type spherical wave generation module and a reflection-type spherical wave generation module; coupled beams are output from a laser, the coupled beams are used as initial input wavefronts for generating two different types of spherical waves, and the initial wavefronts are adjusted by an initial wavefront adjustment module and then enter a transmission-type spherical wave generation module and a reflection-type spherical wave generation module respectively; initial input wavefront deforms correspondingly after passing through the transmission type spherical wave generation module and the reflection type spherical wave generation module and then is transmitted to the radial shearing interference module, final output wavefront is received by the polarization camera, and curvature radius measurement is achieved according to obtained original spherical wavefront distribution. The invention further discloses a method for measuring the curvature radius of the spherical wavefront, and the method has the advantages that large-curvature spherical wavefront recovery is achieved, the method is not affected by vibration operation, and efficient data dynamic collection is achieved.

A tunable, achromatizing optical system for use with a broadband imaging modality system for imaging objects having a range of longitudinal chromatic aberration (LCA) values. The optical system includes an achromatizing component and a parfocal component, for example, a zoom system. A method for tuning the wavefront curvature of different chromatic components of objects having a range of longitudinal chromatic aberration (LCA) values when imaged by a broadband imaging modality system includes the steps of providing a broadband imaging modality system having an entrance pupil, for imaging an object having longitudinal chromatic aberration; providing a tunable, achromatizing optical system; and varying the focal length of the parfocal component while maintaining a conjugate relationship between the achromatizing component and the entrance pupil of the broadband imaging modality system.

The invention relates to a curvature wavefront sensor based on a digital micromirror device. A digital micromirror device is placed between a lens and the focal plane position of the lens, the digital micromirror device is utilized to reflect light wave passing through the lens in two directions to focus light wave, two photoelectric detector arrays are respectively located on two beams of reflection focus light wave in the two directions of the digital micromirror device and respectively detect far field light intensity distribution images of the two beams of reflection focus light wave at different places to obtain two far field light intensity distribution images which are different on a symmetrical out-of-focus face around a focal plane. Relation between light intensity distribution difference normalization of corresponding points on the two out-of-focus faces, incident wavefront curvature and normal curvature of wavefront at the edge of pupil can be obtained according to the fresnel diffraction theory and approximation in geometric optics, and the poisson equation can be utilized to obtain wavefront phase of wavefront to be measured.

The invention provides an endoscope optical system, an endoscope and an endoscope system. The endoscope optical system comprises a diaphragm and a lens assembly, wherein a target lens exists in the lens assembly, and the target surface of the target lens is plated with a filter film layer; and the difference between the curvature of the target surface and the incident wavefront curvature of main light rays of each view field of the target surface is within a set curvature range, so that the incident angle of the main light rays of each view field on the target surface of the target lens is smaller than or equal to a set angle. According to the endoscope optical system, adverse effects caused by wavelength drift are effectively eliminated or reduced, and besides, use of an optical filter is reduced, so that the endoscope optical system is simple in structure and low in cost when wavelength drift is reduced.

A multi channel beamsplitter system operating over a wide spectral band has high optical performance despite the fact that the incoming and/or exiting light is not collimated and its material is dispersive. This is achieved using wavefront compensators that are matched to the curvature of the wavefronts of the incoming and/or exiting light.

The invention discloses a wavefront curvature sensing method and device for a cruising telescope, equipment and a medium, and the method comprises the steps: carrying out the coarse alignment of a large-caliber main focus assembly, and imaging through two staggered sensors located at two sides of a focal plane; when the obtained two defocused star point images corresponding to the double natural guide stars are overlapped, simulating to obtain a light intensity distribution diagram of the two defocused star point images; taking the light intensity distribution diagram of the two defocused starpoint images obtained by simulation as a judgment basis, selecting one defocused star point image and discarding the other defocused star point image, or converting the two defocused star point images into a complete defocused star point image; and obtaining wavefront information of the telescope according to the selected defocused star point image or the light intensity distribution of the complete defocused star point image obtained by conversion. Through the method, the correction capability of curvature sensing can be improved, the finally obtained wavefront sensing result is more accurate, the observation precision of the telescope in the deep space field is improved, and the actual requirements are met.