An all-reflective optical system is described including a concave primary mirror having a central aperture and a radius, the primary mirror having one of a parabolic, non-parabolic conical, or aspherical surface, a convex secondary mirror facing the primary mirror, the secondary mirror having an aspherical surface, where an optical axis extends from a vertex of the primary mirror to a vertex of the secondary mirror, a concave tertiary mirror arranged behind the primary mirror, the tertiary mirror having one of a parabolic, non-parabolic conical or aspherical surface, a concave quaternary mirror arranged in the central aperture of the primary mirror or behind the primary mirror, the quaternary mirror having one of a spherical, parabolic, non-parabolic conical or aspherical surface, and at least one image plane having one or more aggregated sensors, wherein the image plane is positioned at a radial distance from the optical axis that is no more than the radius of the primary mirror.

An optical pulse stretcher includes a first delay optical system including a plurality of concave toroidal mirrors; and a beam splitter including a first surface and a second surface, causing a part of pulse laser light incident on the first surface to be transmitted in a first direction and output as a first beam and another part thereof to be reflected in a second direction and enter the first delay optical system, and causing a part of pulse laser light incident on the second surface from the first delay optical system to be reflected in the first direction and output as a second beam.

A non-linear optical pumping detection apparatus and a non-linear optical absorption cross-section measurement method, which can simultaneously measure degenerate and non-degenerate two-photon absorption cross-section spectra. The measurement process is automatic, efficient and fast. The working wavelength band is from 380 nm to near infrared 1064 nm, and the non-linear performance measurement of the super-continuous wide spectra can be realized. A zoom optical system with a larger entrance pupil diameter is adopted as a weak signal acquisition lens. So the weak signal can be effectively extracted from background noise. Meanwhile, the mean square root diameter of an on-axis image point of the zoom optical system is 100 to 150 microns, the divergence angle 2α of the on-axis image point is 30.6 degrees, which well match the optical fiber coupling condition, thereby improving the coupling efficiency of the space light coupling into the optical fiber, and greatly improving the measurement sensitivity.

An optical module includes a fast-axis mirror that scans a laser beam along a fast-axis, a magnification mirror set formed by three discrete mirrors shaped to magnify the laser beam as it is scanned along the fast-axis and reflect the laser beam after magnification toward a slow-axis mirror that scans the laser beam along the slow-axis, and an Offner mirror relay that receives the laser beam as it is scanned along the slow-axis and reflects the laser beam out an exit aperture. The laser beam as output from the exit aperture is received at an input diffractive grating of a diffractive waveguide, with a user's eye being positioned adjacent an output diffractive grating of the waveguide such that the user's eye views ambient light entering the waveguide from objects within the user's field of view as well as light from the laser beam as it exits the output diffractive grating.

A light display system may display an image to a user and/or an audience using a persistence of vision effect. In an embodiment, a light display system includes a light source configured to emit a plurality of light patterns that correspond to multiple frames of an image. The light source is configured to sequentially emit the plurality of light patterns based on instructions from a control system such that the multiple frames are presented in a sequence at a first rate. The light display system also includes an image expander configured to reflect the plurality of light patterns toward a user of the head-mounted device, wherein at least a portion of the image expander is configured to rotate relative to the light source at a second rate that is coordinated with the first rate by the control system to thereby display the image for visualization by the user.

A light display system may display an image to a user and/or an audience using a persistence of vision effect. In an embodiment, a light display system includes a light source configured to emit a plurality of light patterns that correspond to multiple frames of an image. The light source is configured to sequentially emit the plurality of light patterns based on instructions from a control system such that the multiple frames are presented in a sequence at a first rate. The light display system also includes an image expander configured to reflect the plurality of light patterns toward a user of the head-mounted device, wherein at least a portion of the image expander is configured to rotate relative to the light source at a second rate that is coordinated with the first rate by the control system to thereby display the image for visualization by the user.

An electronic device includes setting means configured to set a predetermined function related to control of the electronic device and capable of being performed regardless of an orientation of the electronic device, orientation detection means configured to detect the orientation of the electronic device, and control means configured to perform control such that in a case where the orientation detection means detects that the electronic device is in a first orientation, a first display is given on display means to prompt to set the predetermined function depending on a setting state of the predetermined function wherein the first display includes a display item for instructing to set the predetermined function by a user operation, and in a case where the orientation detection means detects that the electronic device is in a second orientation different from the first orientation, the first display is not given.

A sensing apparatus can be configured to detect an edge of a paper that is received by an automated transaction machine (ATM). The paper can move along a path located inside the ATM, the path having opposite first and second sides. The sensing apparatus can include a light emitter and a light detector on the first side of the path, with the light emitter positioned so that it can emit light across the path to the second side. The light detector can be configured to detect light from the light emitter and can emit a signal corresponding to an amount of detected light. The sensing apparatus can also include a control circuit that can control a flow of power to the light emitter, and the control circuit can also receive the signal emitted by the sensor.

An imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element. The first optical element has an object-side surface being concave in a paraxial region thereof. The third optical element has negative refractive power.

An all-reflective optical system is described including a concave primary mirror having a central aperture and a radius, the primary mirror having one of a parabolic, non-parabolic conical, or aspherical surface, a convex secondary mirror facing the primary mirror, where an optical axis extends from a vertex of the primary mirror to a vertex of the secondary mirror, a concave tertiary mirror arranged behind the primary mirror, the tertiary mirror having one of a parabolic, non-parabolic conical or aspherical surface, a concave quaternary mirror arranged in the central aperture of the primary mirror or behind the primary mirror, the quaternary mirror having one of a spherical, parabolic, non-parabolic conical or aspherical surface, and at least one image plane having one or more aggregated sensors, wherein the image plane is positioned at a radial distance from the optical axis that is no more than the radius of the primary mirror.