A beam coupling device includes a light source, optical units, and a coupling optical system. The light source includes light emitters arranged in a first direction and a second direction, to emit light beams having a light ray direction intersecting the first and second directions from each of the light emitters. The optical units are arranged to guide each light beam for each set of light emitters arranged in the first direction in the light source. The coupling optical system is arranged to couple the light beams guided by each optical unit. Each of the optical units is arranged to direct outward the light ray direction of the light beam emitted by a light emitter that is located outside in the first direction for the set of light emitters, to guide the light beam from the light emitter into the coupling optical system.

A color splitter, a method of manufacturing the same, and an image sensor including the same are disclosed. The color splitter includes: a color separation element that is formed of a sol-gel material having a high refractive index and exhibits a color separation characteristic; and a low-refractive index layer that has a space in which the color separation element is disposed.

Examples are disclosed that relate to optical systems. One example provides a display device comprising an image source including a plurality of encoded regions from which encoded image light is output, and a Fourier transform array. The Fourier transform array may be positioned to receive the encoded image light and output decoded image light that forms a floating image viewable from a plurality of different vantage points, wherein from a first vantage point decoded image light forming a portion of the floating image originates from a first encoded region, and wherein from a second vantage point decoded image light forming the portion originates from a second encoded region, different than the first encoded region.

An optical element includes a first condensing lens and a plurality of second condensing lenses. The optical element is disposed so as to face an end of an optical fiber. The optical fiber includes a core, a first cladding located around the core, and a second cladding located around the first cladding. The first condensing lens is disposed at a position corresponding to the core. The second condensing lenses are disposed around the first condensing lens at positions corresponding to the first cladding.

A laser processing system includes a laser beam source that produces a raw laser beam; a beam expansion system that receives the raw laser beam and produces an expanded laser beam; a homogenization system that receives the expanded laser beam and produces a laser beam that is homogenized and has a line-shaped beam cross section in the processing plane, wherein the homogenization system includes a first homogenization arrangement that homogenizes along the short axis and a second homogenization arrangement for homogenization along the long axis, each of the homogenization arrangements includes optical elements that split the laser beam into a multiplicity of partial beams and a condenser system that superposes the partial beams in a superposition plane, and the first homogenization arrangement includes a first condenser system with at least one first mirror and the second homogenization arrangement includes a second condenser system with at least one second mirror.

The invention discloses a display module with the divergence angle of an outgoing beam constrained again by the corresponding deflection aperture, which includes a multi-view display structure, a deflection-aperture array and a control device. The multi-view display structure includes a display screen, a light-splitting device, and a backlight-source assembly for providing backlights when a backlit-type display screen is adopted. The light-splitting device guides light beams from each group of pixels or sub-pixels to the corresponding viewing zone. A deflection aperture with a small size is designed for constraining the divergence angle of deflected light beams. Multiple deflection apertures play the function of enlarging the field of view, which is very limited when only a single deflection aperture exists. With orthogonal characteristics being assigned to deflection apertures for suppressing noise and/or for projecting more views, three-dimensional display with natural focus will get implemented with large field of view and low noises.

A phase filter 101 is configured to comprise an annular structure rotationally symmetrical about an optical axis, each annular zone including a cross-sectional shape of substantially parabola for uniformly extending incident rays of light on a focal plane and letting the rays overlap with each other.

An illumination device of the present disclosure includes: a first light source unit that emits first light of a first wavelength band; a first spatial light modulator where the first light from the first light source unit enters; a second light source unit that emits second light of a second wavelength band; an integrator optical system including a first fly-eye lens where the second light from the second light source unit enters and generating illumination light for an illumination target on a basis of the first light having been modulated by the first spatial light modulator and the second light from the second light source unit; and a multiplexing optical system that multiplexes the second light having entered the first fly-eye lens and the first light having been modulated by the first spatial light modulator, in an optical path between the first fly-eye lens and the illumination target.

A beam homogenizer for transforming a beam of laser-radiation into a flat-top intensity distribution having brighter or darker edges comprises a first lens array, a second lens array, and a positive lens. The first lens array includes a plurality of lens elements that are separated by gaps having no optical power. Brighter or darker edges are produced by selecting a distance between the first and second lens arrays that is less than or greater than the focal length of lens elements in the second lens array.

An optical imaging system includes a first lens having positive refractive power, a second lens, a third lens, and a fourth lens, arranged sequentially from an object side along an optical axis. The first lens through the fourth lens are spaced apart from each other along the optical axis in a paraxial region. A total focal length f of a lens unit including the first lens through the fourth lens and half (IMG HT) of a diagonal length of an imaging surface of an image sensor satisfy f/IMG HT>4.9. An effective aperture radius of an object-side surface of the first lens and an effective aperture radius of an object-side surface of the second lens are both greater than effective aperture radii of an object-side surface and an image-side surface of each of the lenses other than the first lens and the second lens.