Abstract: A wavelength tuning system determines a temperature calibrated to a DOE of a structured light (SL) projector. The wavelength tuning system includes a camera and controller. The camera captures images of a SL pattern projected by the SL projector. The controller generates tuning instruction. The tuning instructions cause a wavelength regulator of the SL projector to set a light source of the SL projector to different temperatures. The tuning instruction also cause the camera to capture images of the structured light pattern at each of the different temperatures. Using at least some of the captured images, the controller determines the temperature calibrated to the DOE. In one embodiment, the temperature calibrated to the DOE corresponds to a wavelength of light emitted by the light source that result in an estimated minimum power of a zeroth order diffracted beam of the SL pattern.

Abstract: A head mounted display (HMD) displays content to a user wearing the HMD, where the content may be based on a facial model of the user. The HMD uses an electronic display to illuminate a portion of the face of the user with. The electronic display emits a pattern of structured light and/or monochromatic light of a given color. A camera assembly captures images of the illuminated portion of the face. A controller processes the captured images to determine depth information or color information of the face of the user. Further, the processed images may be used to update the facial model, for example, which is represented as a virtual avatar and presented to the user in a virtual reality, augmented reality, or mixed reality environment.

Abstract: A depth camera assembly for depth sensing of a local area includes a structured light generator, an imaging device, and a controller. The structured light generator illuminates a local area with structured light and includes an illumination source, a mounting element, and a diffractive optical element (DOE) mounted on the mounting element. The mounting element can have a plurality of adjustable positions relative to the illumination source based on emission instructions from the controller. The DOE generates, using light emitted from the illumination source, diffracted scanning beams that are projected as the structured light into the local area. A pattern of the structured light is dynamically adjustable and unique for each adjustable position of the mounting element. The imaging device captures image(s) of the structured light reflected from object(s) in the local area. The controller determines depth information for the object(s) based in part on the captured image(s).

Abstract: An optical characterization system includes a camera assembly and a workstation. The camera assembly is configured to capture images of different portions of a structured light pattern emitted from a device under test in accordance with imaging instructions. In some embodiments, the device under test may be a diffractive optical element (DOE). The workstation provides the imaging instructions to the camera assembly, and stitch the captured images together to form a pattern image. The pattern image is a single image of the entire structured light pattern. The workstation also characterizes performance of the device under test using the pattern image and a performance metric.

Abstract: A depth camera assembly (DCA) for depth sensing of a local area includes a structured light generator, an imaging device, and a controller. The structured light generator illuminates the local area with a structured light pattern. The structured light generator includes a programmable diffractive optical element (PDOE) that generates diffracted scanning beams using optical beams. The PDOE functions as a dynamic diffraction grating that dynamically adjusts diffraction of the optical beams to generate the diffracted scanning beams of different patterns. The diffracted scanning beams are projected as the structured light pattern into the local area, wherein the structured light pattern is dynamically adjustable based on the PDOE. The imaging device captures image(s) of at least a portion of the structured light pattern reflected from object(s) in the local area. The controller determines depth information for the object(s) based on the captured image(s).

Abstract: A manipulator for a fiber optic cable assembly (FOCA) provides microradian accuracy in control of the direction of a beam emanating from the FOCA. Such manipulators can control FOCAs to control the incidence angles of beams at a beam combiner in a beam-combining unit. Accordingly, fewer additional optical elements are required for control of input paths in the beam-combining unit. The manipulator and the beam-combining unit are accurate enough for use in an interferometer that combines beams with different frequencies and polarizations. One such interferometer includes a Zeeman split laser providing a heterodyne beam. A beam splitter separates frequency components of the beams, and AOMs increase the frequency separation between the separated beams. The separated beams can be sent via optical fibers to the beam-combining unit, which combines the beams for use in interferometer optics.

Abstract: An interferometer includes a source of a heterodyne beam including frequency components having frequency components with orthogonal linear polarizations. A beam splitter separates frequency components of the heterodyne beams, and one or more AOMs increase the frequency separation between the separated beams. The separated beams can be sent via optical fibers to a beam-combining unit, which combines the beams for use in interferometer optics.

Abstract: A method to reduce undesirable outgassing includes bonding at least two optical components with a bonding material and encapsulating the bonding material with a capping material. The capping material inhibits the outgassing of species that would otherwise be emitted from the bonding material to the surrounding. In one example, the bonding material is silicone and the capping material is epoxy.

Abstract: Optics used in a high vacuum environment are mounted by bonding by use of addition polymerizing material which used in that environment. The suitability for use in the high vacuum environment is achieved by precise control of outgassing of trapped and dissolved gases, including low molecular weight hydrocarbons and amines, and unreacted material from component parts of said addition polymerizing material. A plurality of application quantities of the polymer are prepared in a large batch for use as pre-mixed frozen (PMF) material. The use of the large batch enables more precise control of mixture so that near-stoichiometric proportions of the polymer components are easily achieved.

Abstract: A method to reduce undesirable outgassing includes bonding at least two optical components with a bonding material and encapsulating the bonding material with a capping material. The capping material inhibits the outgassing of species that would otherwise be emitted from the bonding material to the surrounding. In one example, the bonding material is silicone and the capping material is epoxy.

Abstract: Optics used in a high vacuum environment are mounted by bonding by use of addition polymerizing material which used in that environment. The suitability for use in the high vacuum environment is achieved by precise control of outgassing of trapped and dissolved gases, including low molecular weight hydrocarbons and amines, and unreacted material from component parts of said addition polymerizing material. A plurality of application quantities of the polymer are prepared in a large batch for use as pre-mixed frozen (PMF) material. The use of the large batch enables more precise control of mixture so that near-stoichiometric proportions of the polymer components are easily achieved.

Abstract: Optics used in a high vacuum environment are mounted by bonding by use of addition polymerizing material which used in that environment. The suitability for use in the high vacuum environment is achieved by precise control of outgassing of trapped and dissolved gases, including low molecular weight hydrocarbons and amines, and unreacted material from component parts of said addition polymerizing material. A plurality of application quantities of the polymer are prepared in a large batch for use as pre-mixed frozen (PMF) material. The use of the large batch enables more precise control of mixture so that near-stoichiometric proportions of the polymer components are easily achieved.