An optical interferometer includes a branching-combining unit, a first optical system, a second optical system, and a drive unit. The branching-combining unit includes a branching surface, an incident surface, a first output surface, a combining surface, and a second output surface on an interface of a transparent member, the branching surface partially reflects incident light and outputs as first branched light, and transmits the rest of the incident light into the interior as second branched light, the combining surface partially combines the first branched light and the second branched light to be output to the outside as first combined light, and combines the rest of the first branched light and the second branched light to be propagated into the interior as second combined light, and the second output surface partially outputs the second combined light to the outside.

An optical coherence tomography, OCT, imaging system for imaging an object, comprising an interferometer having a sample arm, and a reference arm which comprises: a first optical fibre; an optical switch controllable to guide reference light from the first optical fibre to a selected optical path of N optical paths, where N is an integer greater than or equal to 2, each of the N optical paths having a respective optical path length and/or chromatic dispersion that differs from the respective optical path length and/or chromatic dispersion of each of the other optical paths; and an optical coupler to guide the reference light propagating along the selected optical path to a second optical fibre. The OCT imaging system detects an interference between the reference light propagating via the second optical fibre and the sample light propagating via the sample arm after having been scattered by the object.

An apparatus for optical coherence tomography (OCT) comprises a light source, a first arm, a second arm, and a processing unit. The first arm has a first dispersive optical assembly that induces a first amount of dispersion into light from the light source and traversing the first arm, where the first arm is one of a sample arm and a reference arm of an interferometer. The second arm has a second dispersive optical assembly that induces a second amount of dispersion into light from the light source and traversing the second arm, where the second arm is the other of the sample arm and reference arm. The second amount of dispersion is larger than the first amount of dispersion. The processing unit processes an interferometry signal to perform OCT, where the interferometry signal represents a superposition of the light from the first arm and the light from the second arm.

An optical coherence tomography (OCT) interferometer includes at least a first optical fiber of a first type having a first length, in series with a second optical fiber of a second type which is different than the first type and having a second length, in at least one of the sample path and/or the reference path of the OCT interferometer. The dispersion characteristics of the first optical fiber and the second optical fiber are significantly different than each other. As a result, the total group delay dispersion of a first portion of the laser light passing through the sample path and the total group delay dispersion of the second portion of the laser light passing through the reference path may offset each other at the detector.

A system for obtaining low-angle circumferential optical access to an eye of a subject. The system includes a light source to generate a beam of light; a beam steering mechanism to steer the beam of light a focusing lens to focus the beam of light; and a contact lens to direct the beam of light into the eye of the subject, the contact lens including a tapered reflective surface to direct the beam of light into the eye of the subject.

A cat's-eye swept source laser designed for Optical Coherence Tomography (OCT) and spectroscopy, focusing on reducing relative intensity noise (RIN). It features a semiconductor gain chip and a cat's-eye configuration with an adjustable bandpass filter managed by an angle-control actuator, optimizing wavelength tuning and noise reduction. This efficient design can eliminate the need for a thermoelectric cooler, simplifying the system and reducing costs. The laser supports various imaging techniques, offering improved signal-to-noise ratios and high-resolution images.

A semiconductor measurement apparatus includes lighting unit; a light receiving unit; and a control unit configured to: generate a prediction equation representing the original image, where the prediction equation is based on a plurality of elements of a Mueller matrix, approximate each of the plurality of elements of the Mueller matrix to a polynomial including bases of a Zernike polynomial and coefficients, generate optimization coefficients based on a sum of the coefficients and a difference between the prediction equation and the original image, determine whether an optimization condition is satisfied based on the optimization coefficients and a minimum value, and select a dimension based on the optimization coefficients and the bases when the optimization condition is satisfied.

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.

An apparatus and a method are described which provide a range of second-order chromatic dispersion correction between a reference arm and a sample arm of an optical coherence tomographic system, while minimizing optical path length differences.

Provided is a reference mirror converter of a Linnik interferometer in which a first object lens 30 focuses light emitted from a beam splitter 20 on a reference mirror 40, a plurality of reference mirrors 40 reflects light incident from the first object lens 30, a plurality of reference mirrors 40 is disposed on a plurality of reference mirror brackets 45, respectively, the plurality of reference mirror brackets 45 is disposed on a rotary plate 60 at the same angles, and the rotary plate 60 is rotated using a motor 70 to control a rotation of the rotary plate 60 to select the reference mirror 40 having a reflectivity similar to that of a target 200 to be measured from among the plurality of reference mirrors 40. Accordingly, since a separate state between articles is maintained at all times, adhesiveness between articles packaged with an easily adhesive material may be prevented.