According to one embodiment, a light source includes a plurality of light-emitting elements each including one or more surface-emitting lasers; and a plurality of detecting elements located on a same substrate as the light-emitting elements. The detecting elements individually detect quantities of output light of the light-emitting elements.

A display system includes a display screen, a light source to generate a light beam to be modulated in accordance with image data, and a beam scanning module to receive the light beams and to direct the light beam onto an associated display region of the display screen. The beam scanning module includes a resonant scanning mirror configured to scan the light beam along a first scanning direction across the associated display region, and a polygon scanning mirror to scan the light beam along a second scanning direction across the associated display region.

A head-mounted display device including a projection device and an optical waveguide is provided. The projection device has an optical pupil located on a second surface of the optical waveguide, and includes a light source, a first MEMS mirror element, a second MEMS mirror element, and a relay optical element group. The relay optical element group has a first axis equivalent focal length corresponding to a first parallel light beam and has a second axis equivalent focal length corresponding to a second parallel light beam. The first parallel light beam and the second parallel light beam travel along an optical axis of the relay optical element group, and a value of the first axis equivalent focal length is different from a value of the second axis equivalent focal length. The head-mounted display device may provide good image quality and a large field of view.

An optical system for a virtual retinal scan display. The optical system includes: a projector unit including a modulatable light source for generating at least one modulated light beam and including a movable deflection device for the light beam, a scanning projection of an image content being generatable from the at least one light beam as a result of the movement of the movable deflection device; a diverting unit, onto which the image content is projectable and which is configured to map the projected image content into an exit pupil and to guide it onto an eye of a user; an optical exit pupil shifting unit situated in an optical path of the light beam for spatially shifting the exit pupil of an eye box of the optical system in directions which extend at least essentially in parallel to an exit pupil plane of the exit pupil.

An optical scanning device includes a substrate, a frame, a plurality of light source modules, and a scanning mirror assembly. The frame is disposed on the substrate to form an accommodating space, and includes a side wall and a reflective portion located on a top end of the side wall and having a light exit. The light source modules are disposed in the accommodating space, surround the scanning mirror assembly, and are configured to provide a plurality of light beams to the reflective portion. The scanning mirror assembly is disposed in the accommodating space and located on a transmission path of the light beams reflected by the reflective portion. The scanning mirror assembly includes a scanning element oscillating along at least one rotation axis and being configured to reflect the light beams to form a scanning light beam transmitted through the light exit out of the optical scanning device.

An optical fiber module is disclosed. The optical fiber module includes a first optical fiber as an MCF, a plurality of second optical fibers as MCFs, a first unit, and a second unit. The first unit has an hole holding the first optical fiber and a plurality of holes respectively holding the second optical fibers. These holes are independent of each other. Each optical fiber has a first part and a second part. An outer surface of a cladding of the first part is coated with a resin. An outer surface of a cladding of the second part is exposed from the resin. The first unit holds the first part. The second unit holds the second part. A boundary between the first part and the second part is positioned in a space between the first unit and the second unit.

Methods, systems, and devices for free-space optical communications. An aircraft includes a flat optical communication terminal on an external surface of the aircraft, the flat optical communication terminal being configured to communicate with a ground station via a free-space optical communication link.

A mobile augmented reality near to eye display having one of a single chip programmed, configured, or adapted to permit user selective field of view and a variable resolution image projection, or a single image guide adapted to multiplexed full color image transfer to achieve full color, 90 degrees FOV, and retinal image resolution.

A light scanning device includes a mirror device that includes a movable mirror which swings about at least one axis, and a package that has at least two or more light transmission surfaces not constituting the same plane and accommodates the mirror device, in which out of the two or more light transmission surfaces of the package, one light transmission surface is a light receiving surface for receiving an incidence ray on the movable mirror from an outside, and the other light transmission surface is a light extraction surface for extracting light reflected by the movable mirror to the outside.

An image forming apparatus includes a light emitting device that emits light, a movable mirror that reflects the light emitted from the light emitting device, a first actuator that causes the movable mirror to swing about a first axis, a first reference signal output portion that outputs a first reference signal by estimating a point in time when a deflection angle of the movable mirror about the first axis becomes equal to a first reference angle, a light emission controller that causes the light emitting device to emit the light based on the first reference signal output from the first reference signal output portion, an imaging apparatus that images the light reflected by the movable mirror, and a correction portion that corrects a timing of the first reference signal output by the first reference signal output portion based on imaging information acquired by the imaging apparatus.