A method for diminishing the signal interference of a transmission path of an optical fiber interference system, belonging to the technical field of optical fiber sensing. A wavelength division multiplexer (19) is connected in series to the end of an induced optical fiber, a wavelength component (2) is separated from an operating path by means of the wavelength division multiplexer (19) so as to measure a signal picked up by a transmission path, and the signal is removed from overall interference sensing signals by taking same as a reference, thereby obtaining a target measurement signal. Also provided is a structure for diminishing the signal interference of a transmission path of an optical fiber interference system. The method and the structure are simple; moreover, the device connected to the end of an induced optical fiber is passive, so that power supply is not required, and it is easy to implement. The present invention can be used for a sensing structure with a single measurement point and can be used in a sensing structure with a plurality of discontinuous measurement points as well.

An alignment system uses a self-referencing interferometer that incorporates an objective lens system having a plurality of lens element groups. In an embodiment, the objective is configured and arranged to provide a large numerical aperture, long working distance, and low wavefront error.

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.

The present invention provides a measurement apparatus for measuring a position of an object, comprising a reflecting portion provided on the object and having a surface on which reflectors configured to retroreflect light are arrayed, an optical system configured to cause first light to be incident on the surface, receive second light as reflected light of the first light, cause third light generated from the second light to be incident on the surface, and receive fourth light as reflected light of the third light, and a processor configured to determine the position of the object based on a detection result of the forth light, wherein the optical system is configured such that a displacement between optical paths of the first light and the second light is corrected by a displacement between optical paths of the third light and the fourth light.

Provided is an optical coherence tomographic apparatus, including: a light source configured to generate light; a light splitting unit configured to split the light from the light source into reference light and measuring light; a detection unit configured to detect intensity of combined light obtained by combining the reference light with return light from an object to be inspected, which is irradiated with the measuring light; an image forming unit configured to form a tomographic image of the object to be inspected based on the detected intensity; and a locating unit configured to locate one of a plurality of objective lenses having different focal lengths and having the same dispersion amount on an optical axis at a position on an optical path of the measuring light opposed to the object to be inspected.

Stackable and/or nestable box having a bottom wall and a side wall which rises from the bottom wall and which is defined by side panels, a front panel and a rear panel. The side panels include at least one recessed portion which is recessing from the containment volume and at least one portion protruding towards the containment volume. The box is configured to be nested within another box and to be stacked with other boxes or other containers with dimensions compatible with, or close to, the dimensions of box.

An interferometer apparatus comprises an adjustable birefringent device configured to receive an input radiation and produce corresponding replicas having reciprocally orthogonal polarizations and delayed from each other by an adjustable time delay. The birefringent device also introduces an additional time delay between the replicas. The interferometer apparatus also comprises a compensation optical device optically coupled to the adjustable birefringent device and configured to have a respective structural thickness and respective ordinary and extraordinary refractive indexes to introduce a compensation time delay between the replicas having a sign opposite to a sign of the additional time delay.

The invention relates to an interferometer for carrying out an optical coherence tomography. The interferometer has at least one first part (13) and a second part (14) which are arranged or can be arranged in a spatially separated manner, wherein the two parts (13, 14) are optically connected together by at least one optical fiber (8). The aim of the invention is to provide an interferometer comprising parts which are optically connected by at least one fiber and which can be moved relative to each other, said parts and fiber being as insusceptible as possible to polarization changes induced by movement and temperature changes. The invention is characterized in that the optical fiber (8) is designed as a polarizing fiber which prefers the propagation of a first light wave with a set first polarization state or polarization mode and impedes the propagation of second light waves with different polarization states or polarization modes than those of the first light wave.

In a OCT interferometer it is necessary to balance dispersion within the reference arm with dispersion within the object arm. This is normally done by replicating within the reference arm the components found in the object arm. This adds to the complexity and cost of the OCT interferometer. A method is provided for determining the design of and designing a simplified OCT interferometer, in which the reference arm contains only a single piece of glass of a single glass type. This reduces the cost and complexity of the OCT interferometer, and reduces power loss and undesired reflections within the reference arm.

An optical probe for irradiating light onto a subject includes an optical path control unit configured to receive light from outside the optical probe, and change a path of the light within the optical probe; an optical path length control element configured to receive the light having the changed path from the optical path control unit, and change an optical path length of the light as the optical path control unit changes the path of the light; and an optical output unit configured to receive the light having the changed optical path length from the optical path length control element, and output the light.