Provided are systems and methods related to hybrid reflective microscope objectives and lens systems used in a spectroscopy system. The objective lens system includes a primary aspheric mirror having a first R-value; and a secondary aspheric mirror having a second R-value smaller than the first R-value, where in the objective lens system has a working distance of at least 20 mm and a numerical aperture of 0.29-0.65, and wherein surfaces of the primary and secondary aspheric mirrors have a non-zero sixth order aspheric parameter.

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.

The present disclosure relates to an optical field and more particularly, to a multi-field of view (FOV) (zooming) optical assembly for a lens and may include an optical element provided in a form of a solid main optical element and including an integrated focal system with two mirrors and at least one integrated afocal system with two mirrors, a plurality of switching optical elements (SOEs) arranged on a front face of the optical element and configured to be switched between an open state in which light is transmitted and a closed state in which light is reflected and/or inhibited, and an image plane curvature correction element.

A laser beam combining device includes: a plurality of shaping optical units which emit circular laser beams which are different from each other in a change amount of an outer diameter per unit travel distance, wherein the plurality of shaping optical units are placed in such a manner that the circular laser beams emitted from the shaping optical units have a concentric shape.

Systems and methods for preventing high-radiant-flux light, such as laser light or a nuclear flash, from causing harm to imaging devices, such as a camera or telescope. In response to detection of high-radiant-flux light, the proposed systems have the feature in common that a shutter is closed sufficiently fast that light from the source will be blocked from reaching the image sensor of the imaging device. Some of the proposed systems include a folded optical path to increase the allowable reaction time to close the shutter.

The present invention discloses an infrared image-spectrum associated intelligent detection method and apparatus, including: first searching for targets in a field of view (FOV), and performing image-spectrum associated intelligent identification sequentially on the searched targets, that is, first performing infrared image target identification on each target, and if a detection identification rate is greater than a set threshold, outputting an identification result and storing target image data; otherwise, acquiring an infrared spectrum of the target, and performing target identification based on infrared spectrum features. The present invention further discloses an apparatus for performing target detection using the above method, and the apparatus mainly includes a two-dimensional scanning mirror, a multiband infrared optical module, a long-wave infrared (LWIR) imaging unit, a broadband infrared spectrum measuring unit, and a processing and control unit. The method and apparatus of the present invention are improvements and enhancements of the conventional infrared target detection method and device, and may be used for infrared image detection, infrared image-spectrum associated detection of the target and infrared spectrum collection of the target. Compared with the conventional infrared detection device, the present invention has a higher performance cost ratio, and can significantly improve the detection identification rate of the target.

Provided are a reflective metasurface primary mirror and secondary mirror, and a telescope system. The reflective metasurface primary mirror includes a transparent substrate and a primary mirror metasurface functional unit pattern disposed on the transparent substrate. The primary mirror metasurface functional unit pattern includes an anisotropic primary mirror subwavelength structure disposed in a set annular region, and a phase introduced by the primary mirror subwavelength structure satisfies a primary mirror phase distribution. The set annular region encircles a light-transmissive hole, and light reflected by the reflective metasurface secondary mirror is focused through the light-transmissive hole.

A variety of femtoprojector optical systems are described. The optical bodies for the systems may be made in batches by wafer-level optics. Each individual system may be made small enough to fit in a contact lens. In some designs, the optical systems include a solid transparent body with a curved primary mirror, a secondary mirror, an entrance window, an exit window, and at least one groove. The grooves function as a light trap that reduces the amount of stray light exiting the body of the optical system. The grooves may also create a snap point which allows removal of individual bodies from the wafer through controlled breakage. The designs may also include various light blocking, light-redirecting, absorbing coatings, or other types structures to reduce stray light.

A Cassegrain or quasi-Cassegrain structure objective lens is used in a polar MOKE metrology system. The quasi-Cassegrain reflective objective lens includes a primary concave mirror and a secondary mirror. The primary concave mirror has a wider diameter than the secondary mirror and defines an aperture through which the laser beam is configured to be transmitted toward the secondary mirror. The secondary mirror can be convex, concave, or have a flat surface.

A mirror system including a primary mirror, and a secondary mirror with different coefficients of thermal expansion. A negative CTE strut can include a main body portion, a first coupling portion and a second coupling portion disposed opposite one another about the main body portion and defining a strut length. The first and second coupling portions can each interface with an external structure. The negative CTE strut can include an offsetting extension member having a first end coupled to the main body portion and a second end coupled to the first coupling portion by an intermediate extension member. The first and second ends can define an offset length parallel to the strut length. When the negative CTE strut increases in temperature, the offset length can be configured to increase due to thermal expansion of the offsetting extension member sufficient to cause the strut length to decrease.