A tunable laser including: an optical cavity including a first and second end mirrors, and a center mirror; a quantum well gain region between the end mirrors; and a transparent heat spreader bonded to the quantum well gain region; wherein the optical cavity is configured to generate resonant laser radiation between the end mirrors; the quantum well gain region includes at least one quantum well that is substantially aligned with an antinode of the resonant laser radiation and is located at a fixed distance to the center mirror; the distance from the first end mirror to the center mirror is optimized to maintain maximum output power, and the distance from the second end mirror to the center mirror is adjustable for tuning the laser to a desired output wavelength; the center mirror maintains an antinode of the resonant radiation at a fixed phase relationship with the center mirror.
H01S 5/185 - Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only horizontal cavities, e.g. horizontal cavity surface-emitting lasers [HCSEL]
H01S 5/062 - Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
H01S 5/0687 - Stabilising the frequency of the laser
H01S 5/10 - Construction or shape of the optical resonator
H01S 5/34 - Structure or shape of the active regionMaterials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
A tunable laser including: an optical cavity including a first and second end mirrors, and a center mirror; a quantum well gain region between the end mirrors; and a transparent heat spreader bonded to the quantum well gain region; wherein the optical cavity is configured to generate resonant laser radiation between the end mirrors; the quantum well gain region includes at least one quantum well that is substantially aligned with an antinode of the resonant laser radiation and is located at a fixed distance to the center mirror; the distance from the first end mirror to the center mirror is optimized to maintain maximum output power, and the distance from the second end mirror to the center mirror is adjustable for tuning the laser to a desired output wavelength; the center mirror maintains an antinode of the resonant radiation at a fixed phase relationship with the center mirror.
H01S 5/10 - Construction or shape of the optical resonator
H01S 5/187 - Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only horizontal cavities, e.g. horizontal cavity surface-emitting lasers [HCSEL] using Bragg reflection
H01S 5/20 - Structure or shape of the semiconductor body to guide the optical wave
3.
OPTICAL MIRRORS MADE OF CARBON FIBER COMPOSITE MATERIAL
A fast steering optical mirror for laser beam deflection, moved by at least one rotational axis, including: a plate containing a plurality of carbon fiber layers laid up in a resin, wherein the plate includes a front face, at least a portion of the front face being polished and coated for laser light reflection; and wherein a surface normal of the front face is aligned orthogonal to the at least one rotational axis. A method of manufacturing fast steering optical mirror including: forming a plate having a front face and a back face by laying up a plurality of carbon fiber layers in a resin; aligning the plate so that a surface normal of the plate is orthogonal to at least one rotational axis of the mirror; and polishing and coating at least a portion of the front face for light reflection.
B29D 11/00 - Producing optical elements, e.g. lenses or prisms
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
4.
OPTICAL MIRRORS MADE OF CARBON FIBER COMPOSITE MATERIAL
ABSTRACTA fast steering optical mirror for laser beam deflection, moved by at least one rotational axis, including: a plate containing a plurality of carbon fiber layers laid up in a resin, wherein the plate includes a front face, at least a portion of the front face being polished and coated for laser light reflection; and wherein a surface normal of the front face is aligned orthogonal to the at least one rotational axis. A method of manufacturing fast steering optical mirror including: forming a plate having a front face and a back face by laying up a plurality of carbon fiber layers in a resin; aligning the plate so that a surface normal of the plate is orthogonal to at least one rotational axis of the mirror; and polishing and coating at least a portion of the front face for light reflection.Date Recue/Date Received 2021-01-18
B32B 5/12 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by structural features of a layer comprising fibres or filaments characterised by the relative arrangement of fibres or filaments of adjacent layers
B32B 5/26 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer another layer also being fibrous or filamentary
B32B 5/28 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer impregnated with or embedded in a plastic substance
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
A positioning system, including: a first plate; a second plate coupled to the first plate and pivotable about an axis; a pair of voice coil actuators configured to rotate the second plate about this axis; and a processor configured to drive currents to the pair of voice coil actuators; wherein the pair of voice coil actuators comprises a first and second magnet structures mounted on the first plate at equal and opposite distance from the axis, and a first and second coils mounted on the second plate and positioned such that the respective first and second magnet structures move in and out of the first and second coils when the second plate rotates about the axis; wherein each of the first and second magnet structures substantially conforms to an arc having a center at the axis and a radius equal to the distance of the magnet structure from the axis.
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
H02K 11/21 - Devices for sensing speed or position, or actuated thereby
ABSTRACTA positioning system, including: a first plate; a second plate coupled to the first plate and pivotable about an axis; a pair of voice coil actuators configured to rotate the second plate about this axis; and a processor configured to drive currents to the pair of voice coil actuators; wherein the pair of voice coil actuators comprises a first and second magnet structures mounted on the first plate at equal and opposite distance from the axis, and a first and second coils mounted on the second plate and positioned such that the respective first and second magnet structures move in and out of the first and second coils when the second plate rotates about the axis; wherein each of the first and second magnet structures substantially conforms to an arc having a center at the axis and a radius equal to the distance of the magnet structure from the axis.- 15 -Date Recue/Date Received 2020-11-05
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
H01F 7/08 - ElectromagnetsActuators including electromagnets with armatures
7.
METHOD FOR PHOTOCOPYING A SEQUENCE OF CUT SURFACES INSIDE A LIGHT-SCATTERING OBJECT WITH IMPROVED SCANNING
The invention relates to a free-beam interferometry method for photocopying a sequence of cut surfaces inside a light-scattering object. The method allows the user to select a larger image field and/or a higher image resolution than possible until now during the occurrence of self-interference of the sample light from a scattering sample.
The invention relates to a full-field OCT method for generating an imaging of an ocular fundus (31), in which short-coherent light (22) is emitted and split into an object beam path (25) and a reference beam path (24). The object beam path (25) is directed onto the ocular fundus (33). The reference beam path (24) and a portion of the object beam path (25) reflected by the ocular fundus (31) are directed onto an image sensor (32), such that an interference between the reference beam path (24) and the object beam path (25) occurs on the image sensor (32), wherein the reference beam path (24) impinges on the image sensor (32) at an angle deviating from the object beam path (25). Before impinging on the image sensor (32), the reference beam path (24) impinges on an optical correction element (27) in order to reduce a chromatic aberration within the reference beam path (24). Intensity information and phase information is determined from a capturing of the image sensor. A focus-adjusted image of the ocular fundus is calculated. The invention also relates to a system that is suitable for carrying out said method. Images of the ocular fundus can be captured without the beam path being previously adapted to the refractive power of the eye lens.
The invention relates to a device which emits a fixation light, wherein the fixation light can be targeted by an eye of an observer in order to fix the line of sight of the eye. The fixation light device comprises a hollow cylinder axicon having an optical axis, a point lighting source for visible light, wherein the point lighting source is arranged on the optical axis in front of the hollow cylinder axicon, a lens, which is arranged on the optical axis behind the hollow cylinder axicon, and a core light aperture, which is arranged between the point lighting source and the hollow cylinder axicon. The arranging of the point lighting source and the hollow cylinder axicon determines the position of a focus distance, and a point from the center region of the focus distance lies in the front focal plane of the lens.
A61B 3/00 - Apparatus for testing the eyesInstruments for examining the eyes
A61B 3/028 - Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuitySubjective types, i.e. testing apparatus requiring the active assistance of the patient for determination of refraction, e.g. phoropters
10.
Method for filtering reflexes in full-field setups for ophthalmologic imaging by separated illumination and detection apertures
A parallel detecting optical coherence tomography (OCT) setup and method, in which the light paths of the illumination of the sample and of the detection of the backscattered light do not use the same apertures. The separation of illumination and detection apertures filters these disturbing reflexes from the backscattered light of the sample and significantly increases image quality.
A61B 3/15 - Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection
A61B 3/10 - Objective types, i.e. instruments for examining the eyes independent of the patients perceptions or reactions
A61B 3/12 - Objective types, i.e. instruments for examining the eyes independent of the patients perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
The invention relates to an interferometric method in which the sample light which is scattered by an object is imaged onto an electronic camera, wherein a sample light portion is assigned to scattering locations on a sectional face in the interior of the object. This sample light portion can be separated from the contributions of the other sample light portions by processing the camera image, and gives rise to a sectional image. A particular advantage of the invention is that a plurality of sectional faces running in parallel at predetermined distances from one another in the interior of the object can be exposed one after another. Such a sequence of sectional images can be used to calculate a volume model of the object. The invention can be applied, in particular, to the living retina and permits a three-dimensional retina scan within several seconds using a cost-effective and, under certain circumstances, hand-held device. Application possibilities are ophthalmology and biometry.
A parallel detecting optical coherence tomography (OCT) setup and method, in which the light paths of the illumination of the sample and of the detection of the backscattered light do not use the same apertures. The separation of illumination and detection apertures filters these disturbing reflexes from the backscattered light of the sample and significantly increases image quality.
A61B 3/15 - Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection
A61B 3/10 - Objective types, i.e. instruments for examining the eyes independent of the patients perceptions or reactions
A61B 3/12 - Objective types, i.e. instruments for examining the eyes independent of the patients perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
There is disclosed a method for detecting spatially structured sample volumes by means of coherent light and digital holography. There is also disclosed a method for analyzing the depth structure of samples in accordance with optical coherence tomography.
G03H 1/00 - Holographic processes or apparatus using light, infrared, or ultraviolet waves for obtaining holograms or for obtaining an image from themDetails peculiar thereto
A61B 5/00 - Measuring for diagnostic purposes Identification of persons
G03H 1/04 - Processes or apparatus for producing holograms
The invention relates to a method for detecting spatially structured sample volumes by means of coherent light and digital holography. The invention also relates to a method for analyzing the depth structure of samples in accordance with optical coherence tomography.
G03H 1/04 - Processes or apparatus for producing holograms
G03H 1/00 - Holographic processes or apparatus using light, infrared, or ultraviolet waves for obtaining holograms or for obtaining an image from themDetails peculiar thereto
patents
