The invention is relates to systems and methods for high dynamic range (HDR) image capture and video processing in mobile devices. Aspects of the invention include a mobile device, such as a smartphone or digital mobile camera, including at least two image sensors fixed in a co-planar arrangement to a substrate and an optical splitting system configured to reflect at least about 90% of incident light received through an aperture of the mobile device onto the co-planar image sensors, to thereby capture a HDR image. In some embodiments, greater than about 95% of the incident light received through the aperture of the device is reflected onto the image sensors.

A laser system comprising a laser configured to emit a laser beam wherein the laser beam is linearly polarized in a polarization plane and an optical assembly comprising a partial reflector having a refractive index and comprising a partially reflective surface. The partially reflective surface is arranged to receive the laser beam at an angle of incidence which lies in a plane of incidence and reflect a portion of the laser beam such that the reflected portion is output from the optical assembly. The partially reflective surface is arranged such that the plane of incidence forms a polarization angle with the polarization plane of the laser beam and the laser beam includes a p-polarized component and an s-polarized component. The angle of incidence and the polarization angle are arranged such that a fraction of the laser beam which is output from the optical assembly, following reflection from the partially reflective surface, is substantially invariant with changes in at least one of the temperature of the partial reflector and a thickness of a contamination layer disposed on the partially reflective surface. The partially reflective surface is arranged to reflect a fraction of the laser beam which is greater than or equal to approximately 0.5% of the laser beam which is incident on the partially reflective surface.

A pulse multiplier includes a beam splitter and one or more mirrors. The beam splitter receives a series of input laser pulses and directs part of the energy of each pulse into a ring cavity. After circulating around the ring cavity, part of the pulse energy leaves the ring cavity through the beam splitter and part of the energy is recirculated. By selecting the ring cavity optical path length, the repetition rate of an output series of laser pulses can be made to be a multiple of the input repetition rate. The relative energies of the output pulses can be controlled by choosing the transmission and reflection coefficients of the beam splitter. This pulse multiplier can inexpensively reduce the peak power per pulse while increasing the number of pulses per second with minimal total power loss.

The present disclosure relates to a holographic display system including: a projection object having a three-dimensional shape corresponding to an original item; an image projection unit comprising projectors projecting unit images of parts selected from a three-dimensional image of the original item on the projection object; and a reflector disposed adjacent to the projection object and reflecting images reflected from the projection object to provide an augmented three-dimensional holographic image. In the disclosure, the unit images corresponding to a three-dimensional image of an original item are projected on the projection object having a three-dimensional shape corresponding to the original item using the projectors and reflected by the projection object and augmented by the reflector, thereby providing a virtual image having three dimensional information corresponding to the original item, whereby a proper image is provided to an observer even when the viewpoint of the observer is changed.

A laser processing head includes: a housing; an entrance portion; an adjustment portion; and a condensing portion. A distance between a third wall portion and a fourth wall portion facing each other in a second direction is shorter than a distance between a first wall portion and a second wall portion facing each other in a first direction. The housing is configured to be attached to an attachment portion of a laser processing apparatus, with at least one of the first wall portion, the second wall portion, the third wall portion, and a fifth wall portion disposed on the side of the attachment portion. The condensing portion is disposed on a sixth wall portion, and is offset toward the fourth wall portion in the second direction.

There is provided an optical system comprising a light conduit. The light conduit comprises a first light pipe, a second light pipe, and a first bridge to mechanically couple the first light pipe to the second light pipe. The first light pipe has a first inlet to receive a first input light signal and a first outlet to emit at least a portion of the first input light signal to form a first output light signal. Moreover, the second light pipe has a second inlet to receive a second input light signal and a second outlet to emit at least a portion of the second input light signal to form a second output light signal. Furthermore, the first bridge has a first end mechanically coupled to the first light pipe and a second end mechanically coupled to the second light pipe.

An illumination device (10) includes: laser light sources (20) having different radiant fluxes; and diffractive optical elements (40) provided correspondingly to the respective laser light sources. A planar dimension of the diffractive optical element, which corresponds to the laser light source that emits a laser light having a minimum radiant flux, is smaller than a planar dimension of the diffractive optical element, which corresponds to the laser light source that emits a laser light having a maximum radiant flux.

An optical engine module including at least two laser sources, collimators, a light combining lens group, an aperture, a beam shaping lens group, a MEMS scanning module, and a beam expansion lens group is provided. The at least two laser sources respectively generate at least two laser beams with different wavelengths. The collimators respectively collimate the at least two laser beams to generate at least two collimated beams. The light combining lens group combines the at least two collimated beams into a combined beam. The aperture filters stray beams of the combined beam. The beam shaping lens group shapes the combined beam to generate a shaped beam with a perfect circle. The MEMS scanning module reflects the shaped beam and scans in horizontal and vertical directions to form a scanning beam. The beam expansion lens group expands the scanning beam into an expanded beam having a predetermined area.

A first optical path length from an emission surface of a first optical system to a reflection surface of a target object is calculated on the basis of first reflected light received by the first optical system and reference light generated by a splitter. A second optical path length from an emission surface of the second optical system to a reflection surface of a reflector is calculated on the basis of second reflected light reflected by the reflector and received by the second optical system and the reference light generated by the splitter A refractive index of a space is calculated on the basis of the second optical path length, and a distance from the emission surface of the first optical system to the reflection surface of the target object is calculated on the basis of the refractive index and the first optical path length.

An illumination device includes: laser light sources having different radiant fluxes; and diffractive optical elements provided correspondingly to the respective laser light sources. A planar dimension of the diffractive optical element, which corresponds to the laser light source that emits a laser light having a minimum radiant flux, is smaller than a planar dimension of the diffractive optical element, which corresponds to the laser light source that emits a laser light having a maximum radiant flux.