37 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.

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 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.

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).

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.

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.

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 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.

The invention relates to a beam analysis apparatus (10) for determining an axial position of a focus (76) of an energy beam (77) of electromagnetic radiation guided in a laser machining optics (100). A beam shaping device (12) is configured to receive a sample beam (70) and to image at least one part of the sample beam (70) on a detector (40) in order to form an intensity distribution (79) on the detector (40). An evaluation device (80) is configured to process electrical signals (64) from the detector (40) and to determine a geometry parameter from the intensity distribution (79). For a more accurate determination of the focal position during on-going machining processes, the evaluation device (80) is configured to receive a cutting gas signal (63), for determining a correction value taking into account the cutting gas signal (63) and for determining the axial position of the focus (76) of the energy beam (77) taking into account the geometry parameter and the correction value. The invention further relates to a system with such a beam analysis apparatus (10) and a method for determining an axial position of a focus (76) of an energy beam (77) guided in a laser machining optics (100).

The invention relates to a device for generating at least one cut surface and to an associated method. The device (100) is used for generating at least one cutting surface in a processing volume (17). The device comprises a laser system (110) having: a laser device (4) for generating a laser beam (6); a beam splitter arrangement (70) having beam splitter optics (70a) for generating a plurality of synchronized laser output beams (90 to 93); a movable focusing optics (18) for focusing the laser output beam as a spot (19) into the processing volume (17); and movement means (8) for moving the focusing optics (18) on at least one path (B) selected from the group consisting of a path in a direction determined by spatial directions x, y and z, a path relative to the central reference axis (a), a path relative to the central axis (A) of the processing volume, and a combination of said paths. The device comprises a control device (11) which is designed to control the beam splitter device (70) and the movement device (8) in such a way that a spot (19) of each laser output beam (90 to 93) in the processing volume (17) is moved on and / or along a respective scanning path (19a), and / or on a respective surface (19c).

A method and a system for measuring carrier-to-envelope phase fluctuations (CEP) fluctuations of a laser field, the method comprising focusing laser pulses in a solid-state material for high harmonic generation, collecting a resulting high harmonic spectrum, and inferring a relative phase of the driving field from the high harmonic spectrum. The system comprises a source of CEP stable mid-infrared laser pulses; a CEP variation unit; a solid state medium; a detector; and first focusing optics focusing pulses generated by the source into the solid state medium and second focusing optics collecting resulting harmonics generated in the solid state medium into the detector.

An overlay metrology system can include an objective lens, illumination optics to illuminate an overlay target including a first grating having a first pitch on a first sample layer and a second grating having a second pitch on a second sample layer, where the first sample layer is separated from the second sample layer by a layer separation distance that is greater than a depth of field of the objective lens. The system can further include a collection optic having a radially varying defocus profile to compensate for the layer separation distance such that the first grating and the second grating are simultaneously in focus on a detector.

A nonlinear microscopy device includes a rotational optical assembly configured to rotate about an imaginary rotational axis and a radial optical assembly that is translatable radially relative to the imaginary rotational axis. The rotational optical assembly includes beam delivery optics to transmit a laser beam to the radial optical assembly, and the radial optical assembly includes an objective lens to focus the laser beam to a focus point, which may be on a sample. While the rotational optical assembly is rotated, the radial optical assembly is moved radially relative to the rotational axis. Secondary light generated by the sample is collected by the objective lens and directed to a detector. The signal received by the detector is converted into a two-dimensional image of the sample. Other embodiments are described and claimed.

The utility model relates to the technical field of micro-nano optics, in particular to a light field switching device and a light field switching and characterization system. The light field switching device comprises a laser, an optical parametric oscillator, a three-dimensional moving table, a substrate and an oil-immersed objective lens fixed on the three-dimensional moving table, the laser, the optical parametric oscillator, the three-dimensional moving table and the substrate are sequentially arranged, a metal film layer is plated on one side of the substrate, and the three-dimensional moving table is configured to bear the oil-immersed objective lens to move relative to the substrate. The three-dimensional moving table is moved to drive the oil-immersed objective lens to move, so that the relative distance between the focus of the oil-immersed objective lens and the metal film layer on the substrate is changed, the focusing degree of the exciting light is controlled, the exciting light focused by the oil-immersed objective lens and the metal film layer are subjected to different reactions, and different fields to be measured are generated. A user can quickly switch different tight focusing light fields and surface plasmon polariton fields only by adjusting the three-dimensional mobile station, and when parameters of incident light are changed, the switching device is still applicable and has high reusability.

A nonlinear microscopy device includes a rotational optical assembly configured to rotate about an imaginary rotational axis and a radial optical assembly that is translatable radially relative to the imaginary rotational axis. The rotational optical assembly includes beam delivery optics to transmit a laser beam to the radial optical assembly, and the radial optical assembly includes an objective lens to focus the laser beam to a focus point, which may be on a sample. While the rotational optical assembly is rotated, the radial optical assembly is moved radially relative to the rotational axis. Secondary light generated by the sample is collected by the objective lens and directed to a detector. The signal received by the detector is converted into a two-dimensional image of the sample. Other embodiments are described and claimed.

Ophthalmic Surgery Visualization System (10) with a device (16) for stereoscopic visualization of an object area with an operating site (12) on a patient eye (14), which includes an image acquisition device (33) for acquiring object area image data containing image data for at least one patient eye registration structure (76), with a computing unit (54), and with a biometric data interface (70) for providing patient eye biometric data, which defines a patient eye model (102) with a model registration structure (76') corresponding to the patient eye registration structure (76) and a model coordinate system (77'), characterized by the fact that The computer unit (54) contains a computer program with a program routine for registering the patient eye model (102) to the patient eye (14) using the patient eye registration structure (76) and the model registration structure (76'), in which the object area image data acquired by means of the image acquisition device (33) are linked with optical imaging parameters of the image acquisition device (33) in order to provide a patient eye coordinate system (77) fixed to the patient eye (14) in the form of data, which is referenced to the model coordinate system (77'), wherein a stereoscopic display device (48) is provided for displaying image information in a stereoscopic visual impression, wherein the computer program has a program routine for calculating stereoscopic display information in the patient eye coordinate system (77),wherein the program routine serves to provide display information data which can be displayed at the display device (48) as a spatially extended structure (122) superimposed on the visualized object area, wherein the device (16) for stereoscopic visualization of an object area includes an adjustable imaging optic with an autofocus system (130) for automatically focusing on a structure (76) of the patient's eye or for automatically focusing on a point (140') in the patient's eye (14) corresponding to a structure (76') of the patient's eye model (102) or to a point (140') in the patient's eye (14) corresponding to a point of interest (140) of the patient's eye model (102), which has a focusing state interface (138) for providing z-focusing and / or xy-scaling of the imaging optics as well as xy-positioning of the device (16) for acquiring stereoscopic image data in a plane perpendicular to an optical axis (21) of a main objective (20) of the imaging optics, wherein the computer program receives information from the group z-focusing, xy-scaling of the imaging optics, xy-positioning from the focusing state interface (138) and receives patient eye biometric data from the biometric data interface and takes this into account for calculating the display information data.

The focusing device comprises a housing and, within the housing, a scanning mechanism with two oscillating scanning mirrors arranged at the entrance of a focusing optics. One or two sources associated with the scanning mechanism generate secondary optical beams to assist focusing by means of a dynamic triangulation focusing system

This application relates to a projection lens, a projection optical system, and an electronic device. The projection lens includes: a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with positive optical power; the first, second, and third lens groups are arranged sequentially along the optical axis from the light-emitting side to the light-receiving side; the first and second lens groups are movably disposed within a groove along the optical axis, used to adjust the focal length of the projection lens by adjusting the distance between the first and second lens groups; the third lens is fixedly disposed within the groove and has the ability to move bidirectionally within a preset range along the optical axis to adjust the focus of the projection lens. This method can achieve high-magnification zoom while maintaining the overall quality of the projected image, while also simplifying the projection lens structure and saving costs.

The invention discloses a fixed-focus optical system, and relates to the technical field of optics, and the fixed-focus optical system comprises an image sensor, a lens group, a diaphragm, a beam splitter, a plane reflector, at least one curved reflector and a wafer which are sequentially arranged from an image plane to an object plane. The fixed-focus optical system further comprises a light source which is arranged corresponding to one side, facing the first reflector, of the beam splitter and is used for emitting illumination light. Wherein the image sensor, the lens group, the diaphragm, the beam splitter and the first reflector form a first optical axis, the beam splitter and the first optical axis are arranged at an included angle, the plane reflector and the first optical axis are arranged at an included angle, and the at least one curved reflector is arranged between the plane reflector and a wafer and used for reflecting illumination light passing through the plane reflector to the wafer. The coaxial hot spot phenomenon is effectively eliminated, and the compactness of the system and the image uniformity are improved.

The invention relates to a laser processing system with a focusing optic (12) for the laser beam (11) and with an optical compensation arrangement (16) that counteracts a thermal change (Δf) of the focal length of the focusing optic (12), wherein the compensation arrangement (16) is formed by a number (x) of identical compensation elements (17) arranged in the path of the laser beam (11), each of which has an at least approximately identical thermal displacement (f). kp ) the focal length of the laser beam (11) in the opposite direction to the thermal focal length (f th ) of the focusing optics (12).

Double sided flow cell and other substrate imaging systems, such as imaging systems used in nucleic acid sequencing and similar processes. In one example, the imaging system includes a flipper to facilitate imaging different surfaces of the flow cell or other substrate. In another example, the imaging system includes two optical systems for imaging different surfaces of the flow cell or other substrate. In another example, the imaging system is an immersion system. In these and other examples, the system may include an auto-focus sub-system configured to accurately focus the optics on one surface of the double sided flow cell without interference from the other surface of the flow cell.

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.