An ocular tube for a microscope, to which an ocular lens is to be attached, includes a superimposition device that superimposes an assistive image on an image plane on which an optical image is formed with light from the microscope.

A master device includes: a light emission circuit configured to emit first laser light; an amplitude control circuit configured to control a scanning amplitude of a micro electro mechanical system (MEMS) mirror that scans the first laser light in a raster scan method; a timing data generation circuit configured to generate timing data that indicates a timing when a scanning angle of the MEMS mirror becomes zero, based on an operation of the MEMS mirror; a buffer configured to store the timing data in one frame of the scanning of the MEMS mirror; a light emission control circuit configured to control light emission of the first laser light by the light emission circuit, based on the timing data generated by the timing data generation circuit; and a data output circuit configured to output data to a slave device that operates dependent on an own device.

The head-up display device includes a display element that emits image light and a virtual image optical system. The virtual image optical system includes a lens unit and a free curved surface mirror disposed along the emission direction of the image light in this order from a position close to the display element. The display element is disposed with a tilting attitude with respect to the optical axis of the lens unit with an end on the housing aperture side in an emission surface being close to an incidence surface in the lens unit and with an end on the opposite side of the housing aperture in an emission surface being apart from an incidence surface in the lens unit. The lens unit has an optical characteristic of optically enlarging an optical path length difference according to a virtual image distance difference.

An optical modulation device includes a first electro-optical device including a first light-emitting element including a light-emitting layer emitting light including a red wavelength region, a second electro-optical device including a second light-emitting element including a light-emitting layer emitting light including a green wavelength region, a third electro-optical device including a third light-emitting element including a light-emitting layer emitting light including a blue wavelength region, and a prism that synthesizes light emitted from the first, second and third electro-optical devices. Each of the first, second and third light-emitting elements includes a first electrode, a second electrode, and a conductive layer provided therebetween and having a lower reflectance with respect to the light emitted from the light-emitting layer than from the first electrode. A thickness of the conductive layer of the third light-emitting element is thinner than thicknesses of the conductive layers of the first and second light-emitting elements.

A transmitting-receiving coaxial laser ranging device and an optical module are provided. The transmitting-receiving coaxial laser ranging device and the optical module optimize the structures and positions of a lens barrel, an objective lens, an ocular lens, an optical module, a laser transmitter, a laser receiver and other parts. The laser transmitter and the laser receiver are disposed on a side of a main optical path, but the objective lens, the ocular lens and two beam splitting prisms in the optical module are disposed on the main optical path. The beam splitting prisms are used to change optical paths of the emitted beam and the received beam, and the emitted beam and the received beam are ensured to be coaxial on the main optical path, such that the target can be aimed at more accurately and distance measurement is more precise, and the user can visually observe the target.

An optical device is provided. The optical device includes a display apparatus including the same, and a method of extending an optical path. The optical device includes at least one electroactive optical cell configured to adjust a phase profile of light, and an optical path extender to extend an optical path by allowing light to transmit through the at least one electroactive optical cell in opposite directions a plurality of times.

A compact eyeprint imaging device is provided. The device includes a plano-convex lens, a right angle triangular prism, a micro lens array, an imaging detector and an external package. The plano-convex lens and the micro lens array are glued on an inclined face of the right angle triangular prism and two right angle faces of the right angle triangular prism are coated with reflecting films, so as to form an integrated combined optical unit, which is inserted into the external package together with the imaging detector. The device is wholly installed on a glasses frame. Light emitted by the eyeprint passes through the plano-convex lens to form parallel light beams, which are reflected twice through the two right angle faces of the right angle triangular prism and then focused through the micro lens array, so as to form a multi-aperture eyeprint image array on the imaging detector.

This disclosure describes an example architecture for providing a delay line for optical techniques. The delay line architecture includes a focusing element that has a focal axis disposed parallel to its length. The line of symmetry provided by the focal axis obviates path-length-dependent aberrations caused by the off-axis beam translations. The systems described herein also provide varying geometries of movable mirrors, including a galvanometer mirror and a rotating polygonal mirror. The systems and methods described herein also provide techniques for generating and detecting coherent Raman spectra using a picosecond probe pulse.

The head-up display device includes a display element that emits image light and a virtual image optical system. The virtual image optical system includes a lens unit and a free curved surface mirror disposed along the emission direction of the image light in this order from a position close to the display element. The display element is disposed with a tilting attitude with respect to the optical axis of the lens unit with an end on the housing aperture side in an emission surface being close to an incidence surface in the lens unit and with an end on the opposite side of the housing aperture in an emission surface being apart from an incidence surface in the lens unit. The lens unit has an optical characteristic of optically enlarging an optical path length difference according to a virtual image distance difference.

A optical phase shifter is provided for adjusting an optical phase of light propagating therethrough along an optical axis. The optical phase shifter includes first and second transparent slides defining a cavity therebetween. A sheet is received in the cavity and has first and second sides. The sheet includes a rigid inner portion alignable with the optical axis and is moveable along the optical axis between a first position and a second position. A tuning structure is operatively engageable with the rigid inner portion of the sheet to selectively move the rigid inner portion of the sheet along the optical axis so as to adjust the optical phase of light propagating through the optical phase shifter.