En face views of OCT volumes provide important and complementing visualizations of the retina and optic nerve head investigating biomarkers of diseases affecting the retina. We demonstrate the combination of real time processing of OCT volumetric data for axial tracking. In combination with a Controllable Optical Element (COE), this invention demonstrates acquisition, real time tracking, automated focus on depth resolved en face layers extracted from a volume, and focus stacked OCT volumes with high resolution throughout an extended depth range.

In a measurement by means of OCT, when dispersion is present in a measured target or an optical system in the vicinity of the measured target, resolution of the measurement is degraded. One spectral interference fringe intensity is acquired when a phase difference between measurement light and reference light is not introduced, two spectral interference fringe intensities are acquired in a time-series manner when a phase difference of π is introduced, a required calculation is performed based on the intensity, and a tomographic image not having reduced resolution due to dispersion is acquired.

An interferometer has a first input configured to provide a first measurement beam at a first frequency, and a second measurement signal at the first frequency. The interferometer has a second input configured to provide a reference beam at a second frequency that is different than the first frequency; an optical element comprising a first portion comprising a polarization beam splitter; and a diffraction grating disposed over the optical element configured to diffract the first measurement beam and the second measurement beam

An OCT device includes a light source that outputs light including a plurality of wavelengths; a division unit that divides light output from the light source into reference light and measurement light; a measurement arm that forms a light path of the measurement light with which a measurement target is irradiated and reflected light from the measurement target, which is generated by the measurement light; a reference arm that forms a light path of the reference light; and a measurement unit that measures the measurement target based on interference light between the reflected light and the reference light. At least one of the measurement arm and the reference arm includes a dispersion unit that disperses light into lights of each wavelength and a dispersed light path portion that forms light paths of dispersed lights, the light paths having a light path length different for each wavelength.

There is described an interferometer for use in an optical locker. The interferometer comprises at least two transparent materials having different thermal path length sensitivities. The interferometer is configured such that an input beam is split by the interferometer into first and second intermediate beams, which recombine to form an output beam, the first and second intermediate beams travelling along respective first and second intermediate beam paths which do not overlap. At least one of the intermediate beam paths passes through at least two of the transparent materials. A length of each intermediate beam path which passes through each transparent material is selected such that an optical path difference between the first and second intermediate beam path is substantially independent of temperature.

There is described an interferometer for use in an optical locker. The interferometer comprises at least two transparent materials having different thermal path length sensitivities. The interferometer is configured such that an input beam is split by the interferometer into first and second intermediate beams, which recombine to form an output beam, the first and second intermediate beams travelling along respective first and second intermediate beam paths which do not overlap. At least one of the intermediate beam paths passes through at least two of the transparent materials. A length of each intermediate beam path which passes through each transparent material is selected such that an optical path difference between the first and second intermediate beam path is substantially independent of temperature.

This disclosure provides photonic integrated chip that has an optical waveguide located on a photonic circuit substrate that includes a photonic circuit that is optically coupled to the waveguide. A microfluidic channel is in a silicon substrate and is attached to the photonic circuit substrate. The microfluidic channel is positioned over the optical waveguide such that its side surfaces and an outermost surface extend into the microfluidic channel. The microfluidic channel extends along a length of the optical waveguide, and nanoparticles are located on or adjacent the optical waveguide located within the microfluidic channel.

A method, measuring device, machining system and computer program product are provided for determining a corrected height signal from measurement data obtained with optical coherence tomography. The measurement data comprises an object signal and a background signal superimposed on the object signal, the object signal and the background signal being subject to different dispersion. A first transformation is performed comprising transforming the measurement data, the first transformation being targeted at the background signal to obtain a height signal, background components in the height signal are determined, the background components in the height signal are compensated to obtain a background-compensated height signal, an inverse transformation is performed comprising back-transforming the background-compensated height signal to obtain background-compensated measurement data, dispersion compensation for the object signal is performed to obtain dispersion-compensated and background-compensated measurement data, and a second transformation is performed comprising transforming the dispersion-compensated and background-compensated measurement data to obtain a dispersion-compensated and background-compensated height signal.

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.

The present disclosure provides an OCT imaging system having a variety of advantages. In particular, the OCT system of the present disclosure may provide a more intuitive interface, more efficient usage of controls, and a greater ability to view OCT imaging data.