The invention relates to an assembly comprising a interferometer for carrying out an optical coherence tomography, wherein the interferometer is divided into two spatially spaced-apart interferometer parts (1, 2), wherein the two interferometer parts (1, 2) can be moved related to one another and are optically connected to one another via flexible light guides (3, 4, 5), which bridge the spatial distance, wherein according to the invention, an assembly having an interferometer is provided, which is as unsusceptible as possible to the effects brought about by bending a tube cable packet and allows for an optimum signal-to-noise ratio or an optimum image quality of an OCT image, characterised in that at least one first flexible light guide (3) is designed as a polarisation-maintaining light guide consisting of two connected polarisation-maintaining light-guiding fibres (3a, 3b).

Method for simultaneously compensating pupil coordinate distortion and shear amount change in a process of wavefront reconstruction in grating transverse shear interference. Where a wavefront is diffracted by a grating, the shapes and light paths of the diffracted wavefronts of all the orders are different, so that on one hand, a coordinate system detected by a detector plane is distorted relative to a pupil coordinate system, and on the other hand, a shear amount changes along with a coordinate position.

A displacement detection device is capable of stably and accurately detecting an amount of displacement. A polarization maintaining fiber has a length not to be equal to a length obtained by dividing, a product of an integral multiple of twice a length of a resonator times a refractive index of the resonator and a beat length obtained from a difference between propagation constants of two polarization modes, by a wavelength of the light source, is selected from a range including a length equal to the above length. The polarization maintaining fiber includes multiple polarization maintaining fibers fitted to each other by removable connectors.

Provided herein are interference objective modules comprising an objective, and an interference module comprising a reference plate disposed apart from the objective to provide a reference arm, a beam splitter to split a source light processed from the objective, and a sample plate to translate the split light from the beam splitter to provide a sample arm, wherein the interference module is configured to make a distance of a focal plane and an interference plane of the interference objective module varied during a measurement, and wherein the focal plane and the interference plane of the interference objective module intersect during the measurement.

The technology disclosed in this patent document can be used to implement an optical coherent tomography (OCT) system that combines a control of the probe light to the target sample with different optical aberration patterns in optically probing the target sample and an OCT imaging processing to enhance the OCT imaging quality by combining image signals from in-phase contributions from the probing with different optical aberration patterns while suppressing randomly phased contributions from scattering by the target sample.

A miniature, micrometer-accuracy, three-dimensional (3D) position-to-optical displacement sensor that has at least one extrinsic Fabry-Perot interferometer (EFPI) in Z direction and a series of plasmonic metasurface resonators with distinctive wavelength-selective characteristics in X and Y directions. The interferometer comprises at least one single mode optic fiber for light propagation, and a substrate mirror to create a light interference fringe as a function of distance between the mirror and the distal end of the optic fiber. Each plasmonic resonator is capable of modifying the substrate mirror and comprises an array of multiple unit nanostructure unit cells that are arranged in a two-dimensional (2D) square lattice or array in the X-Y plane. The nanostructure unit cells are preferably inscribed in the top layer of a three-layer thin film via the focused ion beam (FIB).

An imaging apparatus configured to image an object to be examined is provided. The apparatus includes a splitting unit configured to split light obtained by combining the returned light and the reference light into a plurality of lights having different polarization components; and a detecting unit configured to detect the plurality of lights. The apparatus further includes a correcting unit configured to correct a phase difference between different polarization components generated by an optical member provided on an optical path of the measurement light or an optical path of the reference light.

A distance determining system comprising: a light source, configured to emit light; a first light sensing region, away from the light source for a first distance, comprising at least one first light sensing device; a second light sensing region, away from the light source for a second distance larger than the first distance, comprising at least one second light sensing device; and a processing circuit, configured to compute distance information of an object which reflects the light to the first light sensing region and the second light sensing region, according to a first relation between a first light intensity sensed by the first light sensing region and a second light intensity sensed by the second light sensing region.

The present invention relates to the field of instruments for imaging internal structures of the human body, and in particular of the eye. More specifically it relates to an optimized process and an optical coherence tomography system thereof to measure the distances between the eye interfaces that is, the corneal surfaces, the surfaces of the crystalline lens, the retina and so on. A tiltable selection means, e.g. a titable mirror, is used to switch between different optical sample paths having different lengths, such that information relative to portions of the sample at different depths can be collected.

A device for interferential distance measurement between two objects that are situated in a movable manner with respect to each other along at least one shifting direction includes at least one light source as well as at least one splitting element, which splits a beam of rays emitted by the light source at a splitting location into at least two partial beams that propagate onward at different angles. The device furthermore includes at least one deflecting element that effects a deflection of the incident partial beams in the direction of a merging location, where the split partial beams are superimposed in an interfering manner and the optical paths of the partial beams of rays between the splitting location and the merging location being arranged such that the traversed optical path lengths of the partial beams between the splitting location and the merging location are identical in the event of a change of distance between the two objects. Furthermore, at least one detector system is provided for detecting distance-dependent signals from the superimposed pair of interfering partial beams.