A catadioptric telescope is a modified version of a conventional Maksutov-Cassegrain optical telescope. In accordance with the invention, the reflecting surfaces of the primary mirror and the secondary spot mirror are on the second surfaces of the primary mirror and correcting lens, respectively. In further accordance with the invention, two of these telescopes can be joined together to form a binocular telescope array. The array can be easily customized to suit different remote sensing/satellite applications.

Catadioptric eyepiece system having an exit pupil, comprising a display having a surface disposed in an object plane; optics providing a beam path from the display to the exit pupil and being configured to image a portion of the object plane into an intermediate image formed in a curved intermediate image plane; wherein the optics comprise: a lens system of positive optical power comprising at least one lens, wherein the lens system is disposed in the beam path downstream of the display and upstream of the intermediate image; a concave first mirror disposed in the beam path downstream of the intermediate image and upstream of the exit pupil; and a first beam splitter disposed in the beam path between the lens system and the first mirror and between the first mirror and the exit pupil.

An optical system configured for imaging an object with the use of two independently-scanning reflectors, the optical system having an optical axis and including: first and second scanning reflectors, the first scanning reflector being configured to scan a beam of light incident thereon in a first plane, the second scanning reflector being configured to scan a beam of light incident thereon in a second plane, and the first and second planes being transverse to one another; and a catadioptric afocal relay system disposed along the optical axis in optical communication with, and between, the first and second scanning reflectors, the catadioptric afocal relay system being configured to image one of the first or second scanning reflectors onto another of the first or second scanning reflectors, in light propagating along the optical axis, with a unit magnification, and the catadioptric afocal relay system including only one reflector.

The invention proposed the catadioptric system, which consists of two main components: the first component comprising the two reflective mirrors, in which surface distortion of mirror 1 is parabolic, surface distortion of mirror 2 is aspheric; the second component is a relay consisting of three lenses: lens 1, lens 2, and lens 3 arranged after the medial image plane correspondingly; the second component helps reduce aberration to ensure receiving good quality image at a plane of the sensor.

A catadioptric system (LS) is provided with: a first reflecting mirror (M1) that reflects light from an object; a second reflecting mirror (M2) that reflects light reflected by the first reflecting mirror (M1); a first lens group (G1) that transmits light reflected by the first reflecting mirror (41) and travelling toward the second reflecting mirror (M2), and transmits light reflected by the second reflecting mirror (M2); and a second lens group (G2) that transmits light reflected by the second reflecting mirror (M2) and transmitted through the first lens group (G1). The catadioptric system is configured that an image of the object is formed by light transmitted through the second lens group (G2).

Disclosed is a total reflection based compact near-eye display device with a large field of view. Light rays emitted by an image source (103) are transmitted by using a total reflection prism (101), and are finally subjected to image magnification by means of a near-eye refractive component (105), such that a near-eye display effect with a large field of view is achieved under the conditions of a compact volume.

A modified-Schmidt corrector lens including a first side having a curved surface configured to direct electromagnetic radiation, and a second side having a stepped surface including one or more stepped zones positioned to maintain a substantially constant thickness along a radius of the corrector lens.

A display system includes a light pipe including elongated surfaces. The light pipe is configured to expand the image in a first direction through one of the elongated surfaces. The display also includes a waveguide including an output grating, a first surface, a second surface, and a side surface. The first surface and the second surface have a larger area than the side surface, the output grating being configured to provide the image expanded in a second direction. The second direction is different than the first direction. The image enters the waveguide from the one of the elongated surfaces.

A display system includes a light pipe including elongated surfaces. The light pipe is configured to expand the image in a first direction through one of the elongated surfaces. The display also includes a waveguide including an output grating, a first surface, a second surface, and a side surface. The first surface and the second surface have a larger area than the side surface, the output grating being configured to provide the image expanded in a second direction. The second direction is different than the first direction. The image enters the waveguide from the one of the elongated surfaces.

Provided is a light receiving device including a ball lens, a concave lens that is arranged in a light collecting region of the ball lens, a reflection element that is arranged in association with the concave lens and has a reflection surface that diffracts and reflects an optical signal collected by the concave lens, and a light receiving element that is arranged in association with the reflection element and receives the optical signal diffracted and reflected by the reflection surface of the reflection element.