60 results about "Focus (optics)" patented technology

The invention discloses a wavefront detection-free adaptive optical correction method and system, and the method comprises the steps: obtaining a real in-focus image and a real out-of-focus image of a to-be-corrected light beam, and outputting an updated deformable mirror control voltage through a physical information neural network; generating a predicted wavefront phase according to the deformable mirror control voltage signal and a deformable mirror voltage-phase mapping model; generating a predicted in-focus image and a predicted out-of-focus image through a derivable Fourier optical propagation model; constructing a label-free composite loss function according to the real in-focus image, the real out-of-focus image, the predicted in-focus image and the predicted out-of-focus image; performing unsupervised training updating on the physical information neural network according to the composite loss function, and performing repeated iteration to obtain an optimized deformable mirror control voltage; and driving the deformable mirror to carry out self-adaptive optical correction in real time according to the optimized deformable mirror control voltage to obtain a correction result. According to the invention, the correction efficiency and the system stability are obviously improved.

X-ray optics comprising: (i) achromatic collimation optics adapted to collimate an input X-ray beam to provide a collimated X-ray beam; (ii) an adjustable diffraction unit adapted to: (a) receive the collimated X-ray beam while being configured according to a current configuration associated with a current wavelength selected from among the different wavelengths, the current configuration being selected from among the different configurations associated with the different wavelengths; and (b) filtering the collimated X-ray beam to provide a filtered collimated X-ray beam of a current wavelength; and (iii) achromatic focusing optics configured to focus the filtered collimated X-ray beam to provide a focused filtered X-ray beam.

The invention discloses a pluggable polarization imaging system based on a metasurface and traditional optics and a construction method, and relates to the technical field of polarization imaging. When the metasurface is not inserted or pulled out, the polarization imaging system has a light intensity imaging function; when the super-structure surface is inserted into the imaging system, the polarization imaging system has a polarization imaging function; after the polychromatic light source is incident to the refraction lens of the imaging system, the polychromatic light source is focused and irradiated to the surface of the metasurface, different polarization components in the polychromatic light source are split and deflected to corresponding positions by the surface of the metasurface, and different polarization imaging focuses are formed on the pixel surface of the detector, so that polarization imaging is realized. The imaging system constructed by the invention not only solves the problems of huge volume and difficulty in integration of a traditional polarization imaging mode, but also solves the problems of large aperture and dispersion of a super-structure surface imaging mode, and the whole optical system can adopt different imaging modes for different scenes due to the pluggable characteristic.

A microscopy system (1) is provided for imaging a sample. The microscopy system comprises a light source system (10) configured for providing a first train of optical pulses (T1) at first optical center wavelengths (l1) and a second train of optical pulses (T2) at second optical center wavelengths (l2), both at a first repetition frequency (f1). A repetition rate multiplier (30) is configured to receive the first train of optical pulses (T1) and to output a third train of optical pulses (T3) at a second repetition frequency (f2) different from the first repetition frequency (f1), focusing optics (40) configured to direct the second train of optical pulses (T2) and the third train of optical pulses (T3) to a sample in a focal volume (5). The microscopy system comprises an optical detector (60) configured to detect a transmitted or reflected third train of optical pulses (T31) after interaction in the sample in the focal volume, and a processor (80) configured to process signal components at the first repetition frequency (f1) from the detected transmitted or reflected third train of optical pulses (T31) and to output a signal or a pixel representative of the interaction in the sample.

A method for treating near-retina floaters includes dilating a pupil of an eye of a patient to at least 6.6 millimeters (mm). While the pupil is dilated to at least 6.6 mm, the method further includes emitting, by an optical delivery system, a plurality of pulses from a treatment laser into the eye of the patient, each pulse of the plurality of pulses having a diameter upon passing through the pupil that substantially fills the pupil and having a focus within 3 mm of a retina of the eye of the patient. Pulses may pass through adaptive optics that may be adjusted based on light emitted from the eye, such as two-photon fluorescence or second harmonic radiation, in order to reduce spot size at the focus.

A method and apparatus to maintain image focus on parts such as wafers, circuit boards, or high-density substrates as the part is being inspected. Focus performance is independent of feature and trace orientation and density. This apparatus can be easily integrated into an inspection system and can maintain focus on parts with high aspect ratio structures and or low or non-reflective insulators. It enables the inspection of high-density fine line products requiring the use of high resolution, high numerical aperture (NA) imaging optics with small depths of focus (DOF) that must be kept in focus during the inspection.

A laboratory-based 3D scanning X-ray scanning Laue microdiffraction system and method for crystal material characterization, comprising: focusing optics, a sample located at a distance from the focusing optics, a laboratory X-ray source, a stage to translate and rotate the sample, a detector arranged to detect a Laue diffraction pattern of diffracted X-rays. The method comprises scanning each layer of the sample by translating the sample at different rotations relative to the focused beam to illuminate each voxel in the layer in more than one rotation, and indexing each voxel in the layer using recorded Laue diffraction patterns in different rotations. By repeating the translation and rotation for different layers of the sample, a 3D image of the sample grain structure is reconstructed.

The invention relates to the technical field of microscopy optics, in particular to a spot scanning confocal adjusting system and method, light emitted by a light source is parallel light beams, the divergence angle is smaller than 1mrad, the light beams reach a galvanometer through a spectroscope, reach a target object through a scanning mirror set and an objective lens, return after being reflected by the target object, pass through the spectroscope capable of rotating, and then pass through a scanning mirror set. After being reflected, the laser reaches the confocal hole through the focusing lens; the confocal hole is located at the rear focus of the lens, and confocal imaging is achieved. According to the invention, through the rotatable spectroscope, the imaging condition of the target object at the confocal hole position can be observed by one camera at the same time. The technical problem that the position of the confocal hole is difficult to find if the initial position of the confocal hole is not within the view field range of the camera due to the fact that the confocal hole is small, a camera with a high amplification factor needs to be selected for clearly seeing the confocal hole and the image plane range which can be observed by the camera is very small in the debugging process is solved.

The invention discloses an integrated detection device and method for the shape of a large-aperture long-focal-distance axis lens, belongs to the shape detection of an off-axis lens in precision optics, and aims to solve the technical problem that the shape parameters of the off-axis lens cannot be integrally detected. The device comprises a large-aperture plane interferometer, a to-be-measured lens, a large-aperture computer-generated hologram plate, an attitude alignment module and a precise distance measurement module. A main test area, an alignment area and an off-axis calibration area are arranged on the large-aperture computer-generated hologram plate; and the attitude alignment module and the precision distance measurement module are respectively configured on a tool of a lens to be measured and a tool of a computer-generated hologram plate. The detection method comprises the following steps of: obtaining a background wavefront of the computer-generated hologram detection cavity by adopting a large-aperture standard spherical lens; the pose adjustment of the large-aperture computer-generated hologram plate and the to-be-measured lens is completed based on the large-aperture plane interferometer; measuring the transmission wavefront of the lens to be measured and deducting the background wavefront; and measuring and calculating the rear intercept of the to-be-measured lens, and calculating the off-axis amount by combining the off-axis angle.

Aspects of the disclosure relate to the use of an optical detection scheme enabling multiple imaging sub-systems concurrently optimized for retrieving multiple characterization modalities. The feature described is an offset illumination and detection arrangement for a multimodal imaging probe. The imaging probe comprises multiple waveguides disposed within a torque-transfer coil, distally terminating at longitudinally separated positions. A first waveguide may have focusing optics for focused illumination and / or detection. Any number of other waveguides may be deployed for illumination and / or detection having no focusing optics. The disclosure enables high-fidelity multimodal imaging systems.

The invention discloses a four-focus long-focal-depth broadband achromatic superlens design based on an improved weighted GS algorithm, and belongs to the field of micro-nano optics. The super lens comprises a silicon dioxide substrate and a titanium dioxide cylindrical nano column array. In the initial iteration stage of the GS algorithm, focusing and axicon superposition phases are adopted to construct a complex amplitude field, and a dynamic amplitude weighted feedback mechanism is introduced. According to the design, four off-axis focuses with highly uniform energy are realized on a target focal plane, and focal length drift caused by broadband dispersion is covered by using an expanded super-long focal depth. Simulation shows that within the range of 640-740 nm, the average focal depth of the device reaches 6.33 microns, the focus intensity deviation is smaller than 5%, the average focusing efficiency is 62.47%, and broadband achromatic focusing is effectively achieved. The method has a wide application prospect in the fields of parallel laser processing, high-throughput imaging and the like.

The present invention provides a light-emitting device (1000), comprising: (i) n laser light sources (10), (ii) focusing optics (20), and (iii) a luminescent body (200), wherein: (A) the n laser light sources (10) are configured to generate laser light source light (11); wherein the focusing optics (20) are configured to focus the laser light source light (11) into a focused beam (21) of the laser light source light (11); wherein n≥2; (B) the luminescent body (200) comprises a luminescent material (210), wherein the luminescent body (200) is configured to be in an optical receiving relationship with the n laser light sources (10), wherein the luminescent material (210) is configured to convert at least a part of the laser light source light (11) into luminescent material light (211); (C) the n laser light sources (10) and the focusing optics (20) are configured to provide a spot (300) of the laser light source light (11) on the luminescent body (200) in an operating mode; wherein k groups of spots (300) each have a separately selected number m of spots (300), wherein two or more spots (300) within each group have partial overlap, wherein 2≤m≤n and 1≤k<n; and (D) wherein a first spot region (310) is defined by 10%-100% of the maximum intensity of the spot (300), wherein for at least one spot (300) within at least one of the k groups, it is applicable to overlap with at least another first spot region within the range of 5%-80% of its first spot region (310).

The invention relates to the technical field of optics, and discloses a wide-viewing-angle wavefront sensing device, which constructs an image space telecentric light path through the combination of a diaphragm and a lens group and the arrangement of the diaphragm at the object space focus of the lens group, so that the wavefront of large-angle incidence becomes the wavefront of the incidence of main light rays vertical to a micro lens array after passing through the image space telecentric light path, and the wavefront of the incidence of the main light rays vertical to the micro lens array is formed. The photoelectric sensor is located on the focal plane of the micro-lens array, so that after incident wavefronts at different angles are incident through the diaphragm and are refracted by the lens group, main light rays of the refracted incident wavefronts are vertically and orthogonally incident into the plane of the micro-lens array, are segmented by the micro-lens array and then are transmitted forwards; focusing light spots corresponding to incident wavefronts are formed on the photoelectric sensor, so that the angle detection range of the wavefront sensor is expanded, the wavefront reconstruction precision is improved, and wavefront information of incident light beams in a large field of view is measured at the same time.

A method and system for high-speed 2θ multi-point scatterometry is disclosed. The method includes directing a laser beam from a laser light source to a collimation optical system that collimates the laser beam to a collimated laser beam; adjusting a polarization of the collimated laser beam using a polarization control optics; directing the collimated laser beam that is polarized by a first optical system to illuminate a focal area on a sample surface; receiving reflected light from the focus of the laser light source at the sample surface by a second optical system; detecting the reflected light by a detector system to produce detection signals; and processing the detection signals to measure parameters of the sample surface.

The utility model relates to the technical field of zoom optics, in particular to a zoom optical device based on a liquid lens, which comprises a mounting sleeve, a transparent tube is inserted into one side of the inner wall of the mounting sleeve, and a sliding block is fixedly connected to one side of the bottom of the transparent tube; through the arrangement of the mounting sleeve, the transparent tube, the sliding block, the positioning block, the threaded rod and the limiting block, during use, the mounting groove is formed in the inner bottom wall of the mounting sleeve so that the sliding block at the bottom of the transparent tube can be conveniently inserted in a sliding mode, the connecting rod drives the driving gear at the bottom end to rotate, and the driving gear drives the transmission gears meshed with the two sides of the surface to rotate; the two threaded rods drive limiting blocks with the surfaces in threaded connection to move correspondingly, so that the limiting blocks conveniently move into positioning grooves in the two sides of the inner wall of the mounting groove, the positioning blocks are conveniently and stably mounted in the mounting groove, and sliding blocks at the bottom of a transparent pipe are stably fixed in the mounting groove; therefore, the effect of conveniently disassembling and assembling the liquid lens is achieved.

Method for controlling the distance (14) between the workpiece (9) and the processing optics (8) during cutting, drilling, and ablation of various materials with minimal side effects on non-irradiated areas, wherein the workpiece (9) is irradiated by a pulsed laser (7) with an intensity that generates plasma emission, wherein the strength of the plasma emission is detected, stored, and evaluated in such a way that the distance (14) of the processing optics to the workpiece surface is varied (15) until a local minimum (3) is reached near the maximum intensity of the plasma emission (target position) and sharp cuts and ablation channels are produced, characterized in that the detection of the strength of the plasma emission is carried out by means of a detection system (10) consisting of filters and photodetectors, wherein a spectrometer can also be used instead of a filter.

Improved fluoresced imaging (FI) endoscope devices and systems are provided to enhance use of endoscopes with FI and visible light capabilities. An endoscope device is provided for endoscopy imaging in a white light and a fluoresced light mode. A chromatic adjustment assembly, typically implemented with prisms, compensates for a chromatic focal difference between the white light image and the fluoresced light image caused by the dispersive properties of the optical materials or optical design employed in the construction of the optical channel. The assembly is placed optically between the most proximal rod lens of the endoscope and the focusing optics, typically at an internal telecentric image space, to improve the chromatic correction. The prism assembly directs incoming light with different spectral content along separate paths which compensate for chromatic aberration.

The invention relates to a method for laser processing a workpiece (104) having a material (102) which is transparent for the laser processing, in which method an input laser beam (108) is divided into a plurality of sub-beams (116) by means of a beam splitting element (106), wherein the division of the input laser beam (108) by means of the beam splitting element (106) is effected by imposing a phase on a beam cross section (112) of the input laser beam (108), the sub-beams (116) which are coupled out of the beam splitting element (106) are focused by means of focusing optics (118), a plurality of focal elements (120) is configured by focusing the sub-beams (116), and in the method at least one subset of the configured focal elements (120) is loaded onto the material (102) of the workpiece (104) for the laser processing. The phase imposition is effected by means of the beam splitting element (106) in such a way that at least two of the configured focal elements (120) have different intensities (I).

The invention discloses a three-dimensional optical focus regulation and control device, and relates to the technical field of micro-nano optics. The three cascaded metasurfaces are arranged to be capable of relatively rotating and moving, and the three metasurfaces have the synergistically designed phase distribution functions, so that decoupling control of axial focus change and transverse focus offset is realized. Specifically, a complementary rotation pair is formed by a second metasurface and a third metasurface, and the relative rotation of the second metasurface and the third metasurface is used for adjusting an axial focus and inhibiting aberration (such as coma and astigmatism) introduced by a lateral offset term at the same time; the relative rotation of the first metasurface and the second metasurface mainly regulates and controls an angular phase item to realize the lateral offset of a focus; due to the fact that the phase function is designed to be separable in angular modulation and radial modulation, controlled focuses can transversely move and axially move through different rotation pairs, and independence of the two control modes, namely decoupling regulation and control, is achieved.

An optical system of a head-up hyperopia read-write table is composed of two reflecting mirrors, the first reflecting mirror is a plane reflecting mirror or a concave reflecting mirror, and the second reflecting mirror is a concave reflecting mirror or a plane reflecting mirror. The first reflecting mirror is positioned above an observed object and forms an angle of 10-30 degrees with the horizontal plane, and the second reflecting mirror is positioned on one side below the first reflecting mirror and forms an angle of 55-75 degrees with the horizontal plane. And an observed object on the desktop forms a vertical amplified long-sight-distance virtual image which is the same as the observed object on the left and right in the second reflecting mirror, so that the head-up long-sight-distance reading and writing effect is realized. The optical system solves the problems of ghosting and high cost of the traditional out-of-focus read-write table semi-transparent and semi-reflecting mirror optics.

Various implementations disclosed herein capture sensor data regarding portions of an eye (e.g., the cornea, iris, or retina, etc.) with a near-eye device (e.g., an HMD) using an array of photodiodes embedded within the device's display. The device includes optics configured to focus light from the display on the retina. The device includes a light source configured to illuminate a portion of the eye to be imaged with light having a wavelength (e.g., IR light) that does not interfere with the visible light from the display (e.g., non-IR light). Some implementations, provide outer-eye (e.g., corneal) imaging by accounting for the device's optics having a retinal focus. This may involve, as examples, using wavelength-specific components (e.g., a wavelength specific aperture stop / pinhole, an array of aperture stops / pinholes; a second lens, a meta-surface (for back-and-forth reflections / refractions), or other features.

The utility model discloses a fixed-focus optical system and a security lens, and relates to the technical field of optics, and the fixed-focus optical system is provided with an object side and an image side which are oppositely arranged along the direction of an optical axis. The fixed-focus optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a diaphragm, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a photosensitive chip which are sequentially arranged from the object side to the image side. The fixed-focus optical system can realize infrared confocal, and is high in resolution, bright in picture and better in imaging effect.

Method (1) for laser processing of a glass or glass-ceramic element (2), in which: - the laser beam (7) of an ultrashort pulse laser (10) is concentrated to an elongated focus in the glass or glass-ceramic element (2) by means of a focusing optic (3), wherein: - a pulse power of the ultrashort pulse laser (10) is set which is sufficient to generate filament-shaped damage (6) within the glass or glass-ceramic by means of the laser pulses focused in the glass or glass-ceramic, wherein the focusing optic (3) comprises a lens (4) arranged in the beam path of the ultrashort pulse laser (10), and wherein: - by means of a lens movement device (9), during operation of the ultrashort pulse laser (10), the lens (4) is moved transversely to the beam direction (70) so that the position of the optical axis (40) of the lens (4) relative to the position of the laser beam (7) is changed.and the movement of the lens (4) relative to the laser beam (7) deflects the laser beam (7) and thus shifts the point of impact (71) of the laser beam on the glass or glass-ceramic element (2), wherein the point of impact (71) is guided along a predetermined path forming a dividing line (12) by means of a computing device (15), wherein the lens movement device (9) is controlled by successively emitting control signals, wherein, in response to the successively emitted control signals, the lens (4) of the focusing optics (3) is moved transversely to the beam direction (70), so that the position of the optical axis (40) of the lens (4) changes relative to the position of the laser beam (7), thereby moving the point of impact (71) of the laser beam (7) on the glass or glass-ceramic element (2),wherein- by means of a movement device (17) the glass or glass-ceramic element (2) is moved relative to the ultrashort pulse laser (10) during the incident laser beam (7), so that the point of impact (71) of the laser beam (7) is guided along a predetermined path forming the dividing line (12), which is formed by the superposition of the positions set by means of the lens movement device (9) and the movement device (17), wherein- by the movement of the lens (4) deviations of the point of impact (71) from the predetermined dividing line (12) caused by undesired movement of the glass or glass-ceramic element (2) relative to the ultrashort pulse laser (10), in particular by vibrations or overshoot, during a change of direction of movement are compensated.

The invention discloses a large-aperture lens, and relates to the technical field of optics, and the large-aperture lens sequentially comprises a front lens group, a filter lens group, a first single lens and a first lens group from an object side to an image side. The filter group lens comprises a variable diaphragm; the front group lens has positive focal power, and the front group lens and the filter group lens are fixedly arranged; the first single lens has positive focal power, and the position of the first single lens can move in the optical axis direction; the first lens group has positive focal power, and the position of the first lens group can move in the optical axis direction; when an object is focused from an infinite distance to a close distance, the first single lens and the first lens group are moved along the direction of the optical axis, so that the effective focal length of the large-aperture lens is 40mm-60mm, the aperture value is less than or equal to 0.9, and the effective focal length is 2-4 times of the optical back focus. Through the above mode, the front group lens and the filter group lens are fixed, the first single lens and the first lens group are used as focusing groups, and the whole lens moves from the image side to the object side so as to acquire a large aperture value and an image plane size.

A laser system (1) comprises a laser radiation source (7) for providing a pulsed laser radiation (9), wherein the pulsed laser radiation comprises laser pulses (11) having a pulse energy in the range of 1 mJ to 100 J or in the range of 10 mJ to 1 J and a pulse duration in the range of 10 fs to 5 ps or in the range of 500 fs to 1.5 ps. The laser system (1) further comprises an optical system (3) for spectral broadening of the pulsed laser radiation (9). The optical system (3) comprises: - a first polarization setting optics (19) setting a circular polarization state (17B) of the pulsed laser radiation (9), and - a multi-pass cell (5) having at least two mirrors (25A, 25B) through which the pulsed laser radiation (9) passes forming a plurality of intermediate focus regions (29), wherein the multi-pass cell (5) is filled with a filling gas (5A) having an optical nonlinearity, wherein the filling gas (5A) enables spectral broadening of the pulsed laser radiation (9) in the intermediate focus regions (29). Further, a pressure of the filling gas (5A) is set in a pressure range in which there is an ionization behavior of the filling gas (5A) in the regime of multiphoton ionization, and a focus diameter (d) of the intermediate focus regions (29) is set such that the pulsed laser radiation (9) passes through the multi-pass cell (5) without ionization of the filling gas (5).

A lens element intended to be worn in front of an eye of a wearer, the lens element comprising:-a holder having at least one first refractive power,-a plurality of sets of optical elements superimposed on the holder, each set of optical elements consisting of a plurality of optical elements, a common focal point Fi of the plurality of optical elements is associated at least with a power Pi, characterized in that, for each group of optical elements, the prism angle of each optical element in this group varies as a function of the distance between the optical element and the common focal point Fi of said group of optical elements.

The invention is suitable for the field of optics, and discloses a fundus structure three-dimensional reconstruction method and a fundus imaging system.The fundus structure three-dimensional reconstruction method comprises the steps that a plurality of focus positions calibrated in advance and micromirror array curvatures corresponding to the focus positions are obtained, and the optimal focusing position of fundus imaging is determined; taking the optimal focusing position as a center, determining a fundus imaging coverage focus interval according to the optimal focusing position, and obtaining a fundus image sequence of a focus position covered by the fundus imaging coverage focus interval; for each pixel in the fundus image sequence, calculating neighborhood features corresponding to different focus positions of the pixel in the fundus image sequence to obtain depth scores of the pixel at the different focus positions, and using the focus position corresponding to the highest depth score as height information of the pixel; and forming a point cloud set by combining the transverse coordinate, the longitudinal coordinate and the height information of each pixel, and splicing the point cloud sets to obtain a fundus three-dimensional structure, and accurately reconstructing the fundus three-dimensional structure through micro-mirror focusing.

A system is disclosed for determining a focus or tilt of a target in an alignment sensor. The system includes two optical sensors, each having design features that cause the two optical sensors to have differing outputs with respect to the focus or the tilt of the target based on light sensed by the two optical sensors.

An apparatus for measuring alignment errors of a laser diode or other directional beam source (12) includes a holder (22) for the beam source (12) rotatably mounted about an axis of rotation (18) by a drive (18). The apparatus also includes a first spatially resolved radiation sensor (36), a beam splitter (26) that splits a beam (24) generated by the beam source (12) into a first partial beam (28) and a second partial beam (30), and focusing optics (32). The focusing optics is positioned in the radiation path of the first partial beam (28) and has a focal plane in which the first radiation sensor (36) is positioned. A second spatially resolved radiation sensor (38) is positioned in the radiation path of the second partial beam (30). The computing device (40) calculates the tilt (d) and lateral shift (α) of the beam (24) generated by the beam source (12) from a first position on the first radiation sensor (36) swept by the first partial beam (28) during rotation of the beam source (12), and from a second position on the second radiation sensor (38) swept by the second partial beam (30) during rotation of the beam source (12).

This invention provides a demodulation method and system for free-space optical communication links based on helical fractional orbital angular momentum. N data streams are loaded onto a Gaussian beam, and at least one modulated beam of helical fractional OAM (Optical Aspect-Oriented Motion) is generated through a spatial optical phase modulation module. After coaxial beam combining, the beam is emitted in free space and imaged onto the demodulation phase modulation module plane via an optical relay imaging system. A conjugate helical phase map is loaded to demodulate the target OAM, and the focusing optics module is adjusted to couple the peak of the target OAM beam into a single-mode fiber, while non-target OAM beams are isolated. After verifying the demodulation isolation, the demodulation phase map is switched to sequentially recover each data stream. This invention achieves hybrid multiplexing of helical fractional and integer OAM, and achieves a mode isolation of ≥5dB through a dual isolation mechanism of phase conjugate demodulation and spatial optimal focusing. This improves fiber coupling efficiency and communication link robustness, significantly expanding the channel capacity and spectral efficiency of free-space optical communication.