A pulse width expansion apparatus according to an aspect of the present disclosure includes a polarization beam splitter and a transfer optical system. The transfer optical system includes ¼-wavelength and reflection mirror pairs. The ¼-wavelength mirror pair include first and second ¼-wavelength mirrors. The first ¼-wavelength mirror provides ¼-wavelength phase shift and reflects a pulse laser beam. The second ¼-wavelength mirror provides ¼-wavelength phase shift and reflects the pulse laser beam reflected by the first ¼-wavelength mirror. The reflection mirror pair are disposed on an optical path before and after or between the ¼-wavelength mirror pair. The transfer optical system transfers an image of an input pulse laser beam on the polarization beam splitter to the optical path between the ¼-wavelength mirror pair at one-to-one magnification as a first transfer image and transfers the first transfer image to the polarization beam splitter at one-to-one magnification as a second transfer image.

A view redirecting system for use on a mobility device to redirect a user's view to a more favorable orientation is disclosed. One embodiment includes a first structure having a convex first reflective surface, a second structure having a flat second reflective surface and a third structure. The third structure being an adjustable structure and configured for connecting said first and second structures together. The first structure and the second structure are configured to be positioned such that the first reflective surface and the second reflective surface are facing each other at angle up to and including ninety degrees. The third structure configured to maintain the angle. The system is arranged to redirect a user's view from a first line-of-sight to a second line-of-sight by light interacting with the reflective surfaces The system being configured for attachment to a structural member of the mobility device.

An electronic device includes a lens assembly that receives external light, which is used by a camera module to capture a still image and/or a moving picture, in a first direction, a housing forming an outer portion of the camera module, a first support disposed inside the housing and disposed in a second direction away from the lens assembly, wherein the second direction is perpendicular to the first direction; and a second support including at least a portion protruding in the second direction while surrounding the lens assembly, wherein the first support and the second support are disposed in the second direction away from the lens assembly.

An optical telescope may include an array of optical lenslets in a common plane, and optical waveguides extending from respective optical lenslets and each having a common optical path delay. Further, at least one optical star coupler may be downstream from the optical waveguides, and an optical detector may be downstream from the at least one optical star coupler and having an optical image formed thereon.

Optical zoom system comprising an image sensor, an objective having multiple refractive surfaces and a focus tunable lens which has a tunable optical power, an expansion unit which is arranged to alter a total track length, wherein in the total track length is measured from a first refractive surface of the objective to the image sensor along the optical path.

The present disclosure discloses a telephoto optical imaging system and zoom camera apparatus. The telephoto optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power, a second lens having negative refractive power, an optical path turning prism, and a triangular prism. A total effective focal length F1 of the telephoto optical imaging system may satisfy F1>40 mm. The zoom camera apparatus includes the telephoto optical imaging system and a short-focus optical imaging system arranged in parallel with the telephoto optical imaging system. A total effective focal length F1 of the telephoto optical imaging system and a total effective focal length F2 of the short-focus optical imaging system satisfy F1/F2>5.

An infinity mirror device has a first mirror having a convex first reflective surface, a partially transparent second mirror having a second reflective surface facing the first reflective surface wherein the first and second mirror are spaced apart by a predetermined distance, and a light source disposed in a space between the first and the second mirror.

An optical system including a unity magnification, finite conjugate, all-reflective image relay configured to receive optical radiation representing an input image and to relay the optical radiation via five reflections to an output image plane to provide an output image at the output image plane, the output image being a unity magnification copy of the input image. In certain examples the optical system includes foreoptics configured to produce the input image. The foreoptics and the image relay can be telecentric.

A cascaded focusing and compressing postcompression system includes at least one CASCADE (cascaded focusing and compressing) module. The CASCADE module includes a focusing unit and a compressing unit. The focusing unit is for nonlinear broadening a bandwidth of the light pulses. The compressing unit is for shortening a pulse duration of the light pulses.

A view redirecting system for use on a mobility device to redirect a user's view to a more favorable orientation is disclosed. One embodiment includes a first structure having a convex first reflective surface, a second structure having a flat second reflective surface and a third structure. The third structure being an adjustable structure and configured for connecting said first and second structures together. The first structure and the second structure are configured to be positioned such that the first reflective surface and the second reflective surface are facing each other at angle up to and including ninety degrees. The third structure configured to maintain the angle. The system is arranged to redirect a user's view from a first line-of-sight to a second line-of-sight by light interacting with the reflective surfaces. The system being configured for attachment to a structural member of the mobility device.