An optical see-through glass type display device comprises: an image projector projecting a virtual image; a first optical element configured to guide light of the virtual image; and a second optical element having a first reflection surface for reflecting back light coming through the front surface of the second optical element and a second reflection surface for retro-reflecting light coming through the rear surface of the second optical element. The second optical element is switchable between a first state in which the reflection on the first and second reflection surfaces is enabled and a second state in which the reflection on the first and second reflection surfaces is disabled.

A beam transformer for transforming an input laser beam into a transformed laser beam for use in laser systems for line illumination of an object includes a transparent planar optical element that has a front surface and a back surface, which extend substantially parallel to one another. The optical element has an entrance area and an exit area, and a plurality of reflective surfaces for beam deflection. The beam transformer further includes a cooling device provided at least on the front surface or the back surface of the optical element.

A laser range finder and method for adjusting, comprising a beam source, a photodetector, at least one beam shaping optic, an optic bracket, a circuit board, a beam splitting optic and a connecting device; the beam source comprises a first electro-optical component for emitting a laser beam, the photodetector comprises a second electro-optical component for receiving a received beam reflected and/or scattered by a target object along an optical axis, the beam shaping optic is configured to form a laser beam and/or a receiving beam, the optic bracket comprises a first accommodating seat for fixing the first electro-optical component and a second accommodating seat for fixing the at least one beam shaping optic, the circuit board comprises an another seat for fixing the second electro-optical component, the connecting device is configured to connect the optic bracket with the circuit board; the beam splitting optic is arranged on an adjustment bracket.

Light from an array of laser light sources are spread to cover the modulating face of a DMD or other modulator. The spread may be performed, for example, by a varying curvature array of lenslets, each laser light directed at one of the lenslets. Light from neighboring and/or nearby light sources overlap at a modulator. The lasers are energized at different energy/brightness levels causing the light illuminating the modulator to itself be modulated (locally dimmed). The modulator then further modulates the locally dimmed lights to produce a desired image. A projector according to the invention may utilize, for example, a single modulator sequentially illuminated or separate primary color modulators simultaneously illuminated.

Laser light from a light source part is guided to an irradiation plane by an irradiation optical system. In the irradiation optical system, element lenses are arrayed, and light fluxes that have passed through the element lenses respectively enter transparent elements. Irradiation regions of the light from the element lenses are superimposed on the irradiation plane. When each pair of adjacent target element lenses out of three target element lenses arrayed sequentially is regarded as a target element lens pair, the optical path lengths of three transparent elements corresponding to the three target element lenses are determined such that a peak position of light intensity on the irradiation plane resulting from the interference between the light fluxes through one target element lens pair is different from that corresponding to the other pair. This suppresses variations in light intensity caused by interference between the light fluxes on the irradiation plane.

A processing optical unit for workpiece processing includes a polarizer arrangement comprising a birefringent polarizer element for splitting at least one input laser beam into at least two partial beams each partial beam having one of two different polarization states, and a focusing optical unit arranged downstream of the polarizer arrangement in the beam path and configured to focus the partial beams onto at least two focus zones. The polarizer arrangement has a further optical element arranged downstream of the birefringent polarizer element in the beam path and configured to change an angle and/or a distance of at least one of the partial beams relative to an optical axis of the processing optical unit.

A faceted reflector (32, 32″) for receiving an incident radiation beam (2) and directing a reflected radiation beam at a target. The faceted reflector comprises a plurality of facets, each of the plurality of facets comprising a reflective surface. The reflective surfaces of each of a first subset of the plurality of facets define respective parts of a first continuous surface and are arranged to reflect respective first portions of the incident radiation beam in a first direction to provide a first portion of the reflected radiation beam. The reflective surfaces of each of a second subset of the plurality of facets define respective parts of a second continuous surface and are arranged to reflect respective second portions of the incident radiation beam in a second direction to provide a second portion of the reflected radiation beam.

A reflective optical element includes a first, inner surface region for reflecting a first inner beam portion of a light beam impinging on the reflective optical element in order to form a first reflected light beam, and at least one second, outer surface region for reflecting at least one second outer beam portion of the impinging light beam for forming at least one second reflected light beam. The second surface region is designed to reduce a beam cross section of the second reflected light beam by comparison to the first reflected light beam such that the second reflected light beam extends along a superposition length completely within the first reflected light beam. In addition a beam guiding device has at least one such reflective optical element and an EUV-beam generating device has such a beam guiding device.

A laser optical system including: a beam splitter configured to split a laser beam into a first light and a second light by reflecting a portion of the laser beam and transmitting another portion of the laser beam; a first reflective member located in a path of the first light and reflecting the first light; and a second reflective member located in a path of the first light and reflecting the first light toward the beam splitter after the first light is reflected by the first reflective member, wherein a portion of the first light reflected toward the beam splitter is incident on and passes through the beam splitter and at least partially overlaps the second light.

A method and an apparatus of a powder bed fusion additive manufacturing system that enables a quick change in the optical beam delivery size and intensity across locations of a print surface for different powdered materials while ensuring high availability of the system. A dynamic optical assembly containing a set of lens assemblies of different magnification ratios and a mechanical assembly may change the magnification ratios as needed. The dynamic optical assembly may include a transitional and rotational position control of the optics to minimize variations of the optical beam sizes across the print surface.