An asymmetric transmission film including a body having a first surface and a second surface opposite to the first surface and a transmittance control member disposed in the body such that a forward transmittance of light passing in a direction from the first surface toward the second surface and a reverse transmittance of light passing in a direction from the second surface toward the first surface are different from each other.

An optical radiation-collecting assembly includes a convex mirror, a concave mirror with a central opening and a window, arranged such that light passes through the opening in the concave mirror, is reflected first by the convex mirror and then by the concave mirror, and subsequently passes through the window. The optical assembly is suitable for use in a homing device for guiding a rocket, preventing an optical input component of such a device from being damaged and rendered inoperative from abrasion when exposed to a high-speed air flow containing dense particles. The optical assembly also includes an image-forming function.

A device for spectrally broadening a laser pulse is disclosed. The device includes a multipass arrangement having a convex mirror and a concave mirror, the convex mirror and the concave mirror being arranged relative to each other such that a laser pulse coupled into the multipass arrangement is reflected at least once from the concave mirror to the convex mirror and at least once from the convex mirror to the concave mirror. Further, the device includes a nonlinear optical medium arranged at least partially within the multipass arrangement such that the laser pulse coupled into the multipass arrangement passes through the nonlinear optical medium multiple times. The disclosure also relates to a laser system having a device according to the disclosure for spectral broadening of a laser pulse.

An object of the present invention is to provide an objective optical system and a photoacoustic imaging apparatus capable of obtaining a clearer image of a sample than before. The objective optical system (23) includes: a convex mirror (101) having a convex reflecting surface for reflecting pulsed light traveling toward a sample (SP); a concave mirror (102) having a concave reflecting surface for reflecting the light reflected by the convex mirror (101) and irradiating the sample (SP) with the light; and an ultrasonic detector (103) having at least one end portion provided on an object side of the convex mirror (101), and detecting an acoustic wave obtained by irradiating the sample (SP) with the light.

A device for altering vergence of light to improve human vision of an electronic display. The change in vergence is received at the pupil of the wearer. The altered light effectively recreates the rays emitted by a pixel such that they reach a presbyopic eye as though they were being viewed at a distance (i.e., the rays are substantially parallel). As such, the emmetropic presbyopic eye produces a sharp image of the electronic display. The device comprises: a refractive element that refracts rays, emitted from a pixel of an electronic display, at a predetermined vergence, wherein the refractive element is located directly adjacent or on the electronic display.

An optical device designed to be arranged on a detector provided with an infrared sensor for increasing the angle of the field of view of the detector. The device includes a primary mirror and a secondary mirror that face each other. The primary mirror collects the infrared radiation from a wide-angle field of view to return it to the secondary mirror, which in turn reflects it back to the sensor of the infrared detector.

A catoptric system having a reference axis and including a reflective pattern-source (carrying a substantially one-dimensional pattern) and a combination of two optical reflectors disposed sequentially to transfer EUV radiation incident onto the first optical component to the pattern-source the substantially one-dimensional pattern of which is disposed in a curved surface. In one case, such combination includes only two optical reflectors (each may contain multiple constituent components). The combination is disposed in a fixed spatial and optical relationship with respect to the pattern-source, and represents an illumination unit (IU) of a 1D EUV exposure tool that additionally includes a projection optical sub-system configured to form an optical image of the pattern-source on an image plane with the use of only two beams of radiation. These only two beams of radiation originate at the pattern-source from the EUV radiation transferred onto the pattern-source.

An apparatus includes a first light source to produce a first reference light, a first pair of arrayed waveguide gratings (AWGs) to demultiplex a first optical signal and the first reference light, respectively, into multiple first signal beams and multiple first reference beams. A first heterodyne optical detector can mix the multiple first signal beams and the multiple first reference beams to generate first quadrature optical signals. A first pair of photo-detectors can convert the first quadrature optical signals to first in-phase (I) and quadrature (Q) electrical signals. The apparatus is implemented as a photonic integrated circuit (PIC) incorporating the first pair of AWGs, the first heterodyne optical detector and the first pair of photo-detectors.

An optical arrangement is provided. The optical arrangement has a center axis, an object side, an image side, and a catadioptric arrangement. The optical arrangement has an installation space of no more than 25 millimeters from the object side to the image side along the center axis, and a linear obscuration of no more than 60 percent.

The present invention provides a reflective condensing interferometer for focusing on a preset focus. The reflective condensing interferometer includes a concave mirror set, a convex mirror, a light splitting element, and a reflecting element. The concave mirror set has first and second concave surface portions which are oppositely located on two sides of a central axis passing through the preset focus and are concave on a surface facing the central axis and the preset focus. Light is preset to be incident in parallel to the central axis in use. The convex mirror is disposed between the concave mirror set and the preset focus on the central axis, and is convex away from the preset focus. The light splitting element vertically intersects with the central axis between the convex mirror and the preset focus. The reflecting element is disposed between the light splitting element and the convex mirror.