Multi-order diffractive Fresnel lens (MOD-DFL) and systems that incorporate the MOD-DFL

    公开(公告)号:US12189141B2

    公开(公告)日:2025-01-07

    申请号:US17256044

    申请日:2019-06-28

    Abstract: A multi-order diffractive Fresnel lens (MOD-DFL) that is suitable for use in a space telescope for studying transiting earth-like planets of distant stars is provided. The MOD-DFL may comprise a MOD-DFL array comprising a plurality of MOD-DFL segments that are secured to a mounting surface of a deployment device, such as a balloon, for example, in a preselected arrangement to form the MOD-DFL. An array telescope may be formed of an array of deployment devices, such as an array of balloons, for example, each having a MOD-DFL secured to a mounting surface of the respective deployment device, an optics system disposed inside of the respective deployment device, and a camera disposed inside of the respective deployment device. Each MOD-DFL comprises a plurality of MOD-DFL segments arranged in a preselected arrangement to form the respective MOD-DFL.

    BIREFRINGENT COATING TO REMOVE POLARIZATION DEPENDENT PHASE SHIFT

    公开(公告)号:US20240418921A1

    公开(公告)日:2024-12-19

    申请号:US18687757

    申请日:2022-08-30

    Abstract: Methods, devices and systems are described to eliminate or reduce unwanted polarization aberrations associated with interference filters. An example method for producing a polarization aberration compensator for a thin film interference filter includes obtaining a set of Mueller matrix values based on polarization measurements of the thin film interference filter over a spectral range, and generating a metric based on a difference between a compensated Mueller matrix and an identity matrix over the spectral range. The compensated matrix represents a cumulative Mueller matrix for a combination of the thin film interference filter and the polarization aberration compensator. A configuration of the polarization aberration compensator is determined based on evaluating the metric that eliminates or reduces the difference between the compensated Mueller matrix and the identity matrix over the spectral range. Configuration parameters, including thicknesses of birefringent layers, fast-axis angles and the number of birefringent layers in the compensator are obtained.

    Diffractive trifocal lens
    8.
    发明授权

    公开(公告)号:US12164181B2

    公开(公告)日:2024-12-10

    申请号:US18213147

    申请日:2023-06-22

    Abstract: A diffractive multifocal lens is disclosed, comprising an optical element having at least one diffractive surface, the surface profile comprising a plurality of annular concentric zones. The optical thickness of the surface profile changes monotonically with radius within each zone, while a distinct step in optical thickness at the junction between adjacent zones defines a step height. The step heights for respective zones may differ from one zone to another periodically so as to tailor diffraction order efficiencies of the optical element. In one example of a trifocal lens, step heights alternate between two values, the even-numbered step heights being lower than the odd-numbered step heights. By plotting a topographical representation of the diffraction efficiencies resulting from such a surface profile, step heights may be optimized to direct a desired level of light power into the diffraction orders corresponding to near, intermediate, and distance vision, thereby optimizing the performance of the multifocal lens.

    MANAGING AN OPTICAL PROBE BEAM FOR DISPLACEMENT SENSING

    公开(公告)号:US20240402301A1

    公开(公告)日:2024-12-05

    申请号:US18693196

    申请日:2022-09-22

    Abstract: An optical beam is provided from a transmitter aperture to a receiver aperture that receives the optical beam after displacement by a path shifting component. Received initial displacement information characterizing at least one of: an initial estimate of the displacement, or an indication that the displacement is below a predetermined threshold. Received input beams each have a different spatial mode, from a set of mutually orthogonal spatial modes that include: a lowest order spatial mode, a highest order spatial mode, and one or more intermediate order spatial modes. A relative amount of each of the input beams to be included in the optical beam is determined based at least in part on: corresponding diffraction loss estimates for each of the input beams, and the initial displacement information. One of the input beams that has a largest relative amount in the optical beam is one of the intermediate order spatial modes.

    SURGICAL TRAINING DEVICES AND METHODS

    公开(公告)号:US20240395170A1

    公开(公告)日:2024-11-28

    申请号:US18674202

    申请日:2024-05-24

    Abstract: Surgical training devices, kits, and associated methods are disclosed. The surgical training devices include a body shaped to correspond to an animal. The surgical training devices also include an insert for removable insertion into an opening in the body. The insert can be to be covered by a cover, which can be removably attached to the insert. An entirety or majority of the body, the insert, and the cover can be formed of materials sourced from sources other than the animal.

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