An optical unit includes first to third prisms. The first prism has a first coated surface configured to reflect illumination light in a first wavelength band, a first surface, and a first light transmitting surface. The second prism has a second coated surface configured to reflect the illumination light in a second wavelength band, a second surface, and a second light transmitting surface. The third prism has a third light transmitting surface, and a fourth light transmitting surface. The first prism is formed with normal lines of the first coated surface, the first surface, and the first light transmitting surface being out of coplanar with each other, and/or the second prism is formed with normal lines of the second coated surface, the second surface, and the second light transmitting surface being out of coplanar with each other.

A laser apparatus includes a laser generator configured to generate a first laser beam proceeding along a first direction, and an inversion module configured to convert the first laser beam to a second laser beam proceeding along the first direction, the inversion module including a splitter configured to form a reflected laser beam by partially reflecting the first laser beam, and a transmitted laser beam by partially transmitting the first laser beam, and a prism configured to reflect the reflected laser beam.

A device for interfering with the optical navigation capability of an organism moving in air, comprising at least a detector, a projector and a control device connected to the detector and the projector, which is characterized in that using the detector a biological feature of an organism may be identified by way of at least a signal, wherein the control device then determines the trajectory of the organism and, in dependence on the species and trajectory of the organism, indicates a light pattern, which may be projected using the projector.

A display apparatus for presenting three-dimensional imagery, including an optical combiner having a first side, a second side, a third side and a fourth side. The second side is opposite to the first side and the fourth side being is opposite to the third side. Optical combiner further includes a first semi-transparent reflective portion arranged to reflect light incoming from the first side towards the fourth side and a second semi-transparent reflective portion arranged to reflect light incoming from the second side towards the fourth side. Light incoming from the third side passes through the first semi-transparent reflective portion and the second semi-transparent reflective portion towards the fourth side. The display apparatus further includes of a first display, a second display and a third display arranged at a first distance, a second distance and a third distance from the first side, the second side and the third side of the optical combiner, respectively, wherein a first image, a second image and a third image rendered at the first display, the second display and the third display are presented at a first focal distance, a second focal distance and a third focal distance, respectively, thereby creating the three-dimensional image.

The present disclosure provides methods for generating a three-dimensional object, comprising directing at least one strand material from a source of at least one strand material towards a base. Next, at least a first light beam and a second light beam from a light source is used to subject at least one strand material to heating at one or more locations along at least one strand material. At least a portion of the three-dimensional object may be generated from at least one strand material upon subjecting at least one strand material to heating along one or more locations.

A vehicle-mounted dual-oblique asymmetric laser velocity measurement device is provided. A small-angle splitting prism (9) is installed on a laser path where the laser beam of the reference-beam LDV probe is incident onto a driving surface. The laser beam is split by the small-angle splitting prism (9) into two emergent beams having an included angle α for incidence onto the driving surface. Two ground-scattered light beams returning along the original direction of the two emergent beams are used as signal light together. Reference light is mixed with the signal light on a photosensitive surface of a photodetector of the reference beam LDV probe. The photodetector mixes the reference light and the signal light to form Doppler signals for transmission to a signal processing unit (10). The signal processing unit (10) extracts the Doppler frequencies corresponding to the two emergent beams separately, to implement velocity calculation.

Provided is an optical apparatus that includes an illumination assembly which include an extended radiation source emitting radiation with a controllable spatial distribution and telecentric condensing optics, configured to receive and project the emitted radiation with a numerical aperture exceeding 0.3 along a first optical axis onto a field and an imaging assembly that includes a sensor and objective optics configured to image the field along a second optical axis onto the sensor and also a prism combiner positioned between the field and the condensing and objective optics which is configured to combine the first and second optical axes, while reflecting at least one of the optical axes multiple times within the prism combiner.

The present invention discloses a laser range finder for two-color switching display, comprising a monocular telescope, a laser light emitting system, a laser receiver and an OLED liquid crystal display (LCD) imaging system, wherein the monocular telescope comprises an objective lens, a roof half penta prism, a cemented prism, an eyepiece and an LCD unit; laser light emitted by the laser light emitting system is emitted onto an object to be measured, and the reflected back laser light is received by the laser receiver after passing through the objective lens, the roof half penta prism and the cemented prism; and light emitted by the OLED LCD imaging system is imaged on the focal plane of the eyepiece through the cemented prism. The present invention can achieve two-color display of the laser range finder, meeting the requirements for use in a variety of conditions.

An illuminating module includes a light source assembly which includes a first lens unit. The light source assembly is configured to produce an illuminating beam, wherein the optical apparatus includes an optical modulation module and a light guiding module, the optical modulation module is parallel corresponding to the first lens unit, the illuminating beam passes through the optical modulation module to be an image beam having an image, and the image beam travels in the light guiding module, and leaves the light guiding module. The illuminating beam obliquely enters the optical modulation module.

An apparatus includes a light intensity sensor arrangement, a focusing unit for focusing the light beam at a specified location on the light intensity sensor arrangement, and an adjustment unit which adjusts a relative position of the intensity centroid of the light beam in relation to a specified location on the light intensity sensor arrangement when there is a change in the beam angle present upon entry in the apparatus. The adjustment unit is configured to keep the relative position of the intensity centroid of the light beam in relation to the specified location on the light intensity sensor arrangement constant up to a specified maximum deviation. The maximum deviation corresponds to half the mean beam diameter upon incidence on the light intensity sensor arrangement.