An apparatus and a method for powder bed fusion additive manufacturing involve a multiple-chamber design achieving a high efficiency and throughput. The multiple-chamber design features concurrent printing of one or more print jobs inside one or more build chambers, side removals of printed objects from build chambers allowing quick exchanges of powdered materials, and capabilities of elevated process temperature controls of build chambers and post processing heat treatments of printed objects. The multiple-chamber design also includes a height-adjustable optical assembly in combination with a fixed build platform method suitable for large and heavy printed objects. A side removal mechanism of the build chambers of the apparatus improves handling and efficiency for printing large and heavy objects. Use of a wide range of sensors in the apparatus and by the method allows various feedback to improve quality, manufacturing throughput, and energy efficiency.

An optical beam expander and a luminaire, including: a collimating lens configured for adjusting light emitted by a light source to parallel light; a condensing lens, the condensing lens including a plurality of inclined light-control surfaces, and any one of the light-control surfaces is not parallel to a plane in which the condensing lens is located, the condensing lens being configured for refracting the parallel light emitted from the collimating lens towards a direction of a center line of the condensing lens; and a fixing component, configured for fixing the collimating lens and the condensing lens, so that an optical axis of the collimating lens coincides with an optical axis of the condensing lens.

A light emitting apparatus includes a first holder configured to hold a light source, a second holder configured to hold an optical element that condenses light from the light source, and a screw member screwed with a screw portion formed in the second holder and having an axis along a direction of an optical axis of the optical element. The screw member and the first holder respectively have contact surfaces that are along a plane orthogonal to the optical axis and in contact with each other. A recess is formed in at least one of the contact surfaces. An adhesive adhering the screw member and the first holder to each other is disposed in the recess formed in the at least one of the contact surfaces.

An optical device for imaging a first, object-side set of mutually parallel bundles of beams onto an image surface, includes

an optical beam expansion unit;
an optical rearrangement unit configured to rearrange the first set of mutually parallel bundles of beams while maintaining mutually parallelism to obtain a second set of mutually parallel bundles of beams;
an optical element configured to direct the second set of one or more bundles of beams onto the optical beam expansion unit by means of bundling, so that the optical beam expansion unit is reached by a third set of bundles of beams,
the optical beam expansion unit being configured to expand each bundle of beams of the third set to obtain a fourth set of expanded bundles of beams; and
an optical imaging unit configured to image the fourth set of expanded bundles of beams onto the image surface.

The present invention discloses a foldable anti-lost quickly focused laser apparatus. The apparatus comprises a laser apparatus body. The laser apparatus body is provided with a focusing lifting lever. One side of the laser apparatus body is provided with a rotating shaft, and the focusing lifting lever is provided with an axle hole matched with the rotating shaft, so that the focusing lifting lever is rotatably arranged on the laser apparatus body. Furthermore, the laser apparatus body is provided with a fixing structure for fixing the focusing lifting lever on an upper side of the rotating shaft.

The disclosure provides a collimating lens, a projecting module, and a mobile phone. An object side of the collimating lens is defined as adjacent to a laser transmitter, an image side of the collimating lens is defined as adjacent to an object to be measured. Along an optical axis from the object side to the image side, the collimating lens sequentially includes a first lens, a second lens, a third lens and a stop. An object side surface of the first lens is convex, an object side surface of the second lens is concave surface, an object side surface of the third lens is convex, and an image side surface of the third lens is convex. The stop is positioned between the third lens and the object to be measured. The material of each of the first lens, the second lens, and the third lens is plastic.

Methods for imaging a sample using fluorescence microscopy, systems for imaging a sample using fluorescence microscopy, and illumination systems for fluorescence microscopes. In some examples, a method includes positioning the sample such that a plane of interest of the sample is coplanar with a focal plane of a detection objective of a microscope. The method includes positioning a paraboloidal mirror around the sample such that a focal point of the paraboloidal mirror is coplanar with the focal plane of the detection objective and the plane of interest of the sample. The method includes directing a beam of annularly collimated excitation light on the paraboloidal mirror to focus a disc of light on the sample and thereby to provide 360 degree lateral illumination of the sample. The method includes imaging the sample through the detection objective.

Optical sensors and particularly gimbaled optical sensors transmit an active signal at a given wavelength(s) and receive passive signals over a range of wavelengths and the active signal in a common aperture. The sensor includes a Tx/Rx Aperture Sharing Element (ASE) configured with an annular region that couples an active signal having a ring-shaped energy distribution to the telescope for transmission and a center region that couples the passive emissions and the returned active signal to the detector. A beam shaping element such as an Axicon lens, LCWG, Risley Prism, Unstable Optical Resonator or MEMS MMA may be used to form or trace the ring-shaped active signal onto the annular region of the ASE. A focusing optic may be used to reduce the divergence of the active signal so that it is collimated or slightly converging when transmitted such that the returned active signal approximates a spot. A filter wheel may be positioned behind the ASE to present separate passive and active images to the detector. These optical sensors may, for example, be used with guided munitions or autonomous vehicles.

A laser radiation system according to a viewpoint of the present disclosure includes a first optical system configured to convert a first laser flux into a second laser flux, a multimirror device including mirrors, configured to be capable of controlling the angle of the attitude of each of the mirrors, and configured to divide the second laser flux into laser fluxes and reflect the laser fluxes in directions to produce the divided laser fluxes, a Fourier transform optical system configured to focus the divided laser fluxes, and a control section configured to control the angle of the attitude of each of the mirrors in such a way that the Fourier transform optical system superimposes the laser fluxes, which are divided by the mirrors separate from each other by at least a spatial coherence length of the second laser flux, on one another.

Embodiments relate to a systems and methods for preventative irradiative dental treatment. In accordance with one embodiment, a system and method include using a radiation source to generate a radiation; using an optic disposed to accept the radiation to internally reflect he radiation at a first end; using at least one side of the optic to contact a dental hard tissue; using the optic to couple some of the radiation into the dental hard tissue; and, using a controller to control a parameter of the radiation to heat a surface of the dental hard tissue.