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    Polarization-independent diffractive optical structures
    2.
    发明授权
    Polarization-independent diffractive optical structures 有权

    公开(公告)号：US11175441B1

    公开(公告)日：2021-11-16

    申请号：US16293122

    申请日：2019-03-05

    Applicant: Beam Engineering for Advanced Measurements Co.

    Inventor： Nelson V. Tabirian ,  David E. Roberts

    IPC: G02B5/30 ,  G02B5/18 ,  G02B27/42

    Abstract: Diffractive optical structures, lens, waveplates, systems and methods of combinations of CDWs (cycloidal diffractive waveplates) and PVGs (polarization volume gratings) that result in high efficiency polarization-insensitive diffraction. Although our modelling and experiments were performed for structures with optical axis orientation periodic along one of the Cartesian coordinates parallel to the plane of the structure, the results are applicable to more complex structures such as diffractive waveplate lenses. The focusing performance of such structures can be predicted by considering the structure to be locally periodic along one axis.

    Diffractive Mirrors and Diffractive Telescopes with Corrected Temporal Dispersion
    7.
    发明申请
    Diffractive Mirrors and Diffractive Telescopes with Corrected Temporal Dispersion 审中-公开
    具有校正时间色散的衍射镜和衍射望远镜

    公开(公告)号：US20160370599A1

    公开(公告)日：2016-12-22

    申请号：US15189551

    申请日：2016-06-22

    Applicant: Beam Engineering for Advanced Measurements Co.

    Inventor： Nelson V. Tabirian ,  David E. Roberts

    IPC: G02B27/42 ,  G02B23/06 ,  G02B5/30 ,  G02B5/18

    CPC classification number: G02B27/4211 ,  G02B5/1814 ,  G02B5/1833 ,  G02B5/1876 ,  G02B5/1895 ,  G02B5/3083 ,  G02B23/06

    Abstract: Mirrors, lenses, devices, apparatus, systems and methods for correcting temporal dispersion of laser pulses or other pulses of electromagnetic radiation in diffractive telescopes used in applications, such as but not limited to optical telescopes, transmitters, receivers, and transceivers for laser communication and imaging. Diffractive lenses and mirrors allow for producing large area telescopes and reducing or eliminating temporal dispersion of laser pulses and other pulses of electromagnetic radiation recorded by such telescopes. This can be achieved by utilizing high efficiency thin film diffractive optical films, particularly, diffractive waveplates, and having a secondary diffractive mirror of a shape selected to assure that the propagation time from the flat primary collecting lens or mirror is independent of the position on the flat primary collecting lens or mirror at which the radiation impinges.

    Abstract translation: 用于在应用中使用的衍射望远镜中的激光脉冲或其他电磁辐射脉冲的时间色散的反射镜，透镜，装置，系统和方法，所述衍射望远镜例如但不限于光学望远镜，发射器，接收器和用于激光通信的收发器， 成像。 衍射透镜和镜子允许生产大面积望远镜并减少或消除由这种望远镜记录的激光脉冲和其他电磁辐射脉冲的时间分散。 这可以通过利用高效薄膜衍射光学膜，特别是衍射波片，并且具有选择的形状的次级衍射镜来确保从平坦的初级聚光透镜或反射镜的传播时间与在 平坦的初级收集透镜或辐射入射的反射镜。

    DIFFRACTIVE WAVEPLATE DEVICES THAT OPERATE OVER A WIDE TEMPERATURE RANGE
    8.
    发明申请
    DIFFRACTIVE WAVEPLATE DEVICES THAT OPERATE OVER A WIDE TEMPERATURE RANGE 有权

    公开(公告)号：US20210041729A1

    公开(公告)日：2021-02-11

    申请号：US16928526

    申请日：2020-07-14

    Applicant: Beam Engineering for advanced measurements Co.

    Inventor： Nelson V. Tabirian ,  Justin L. Sigley ,  Zhi J. Liao ,  David E. Roberts

    IPC: G02F1/1337 ,  G02F1/13

    Abstract: Diffractive optical structures, lenses, waveplates, devices, systems and methods, which have the same effect on light regardless of temperature within an operating temperature range. Temperature-compensated switchable diffractive waveplate systems, in which the diffraction efficiency can be maximized for the operating wavelength and temperature by means of adjustment of the electric potential across the liquid crystal or other anisotropic material in the diffracting state of the diffractive state, based on prior measurements of diffraction efficiency as a function of wavelength and temperature. The switchable diffractive waveplates can be a switchable diffractive waveplate diffuser, a switchable cycloidal diffractive waveplate, and a switchable diffractive waveplate lens. An electronic controller can apply an electric potential to the switchable diffractive waveplate. Amplitudes of the electric potential can be determined from lookup tables such that diffraction efficiency at an operating wavelength and measured temperature is maximized. A communications channel can transfer the measured temperature from temperature measurement means to the electronic controller.

    Electro-optical diffractive waveplate beam shaping system
    10.
    发明授权
    Electro-optical diffractive waveplate beam shaping system 有权

    公开(公告)号：US10423045B2

    公开(公告)日：2019-09-24

    申请号：US15350856

    申请日：2016-11-14

    Applicant: Beam Engineering for Advanced Measurements Co.

    Inventor： David E. Roberts ,  Nelson V. Tabirian

    IPC: G02F1/13 ,  G02F1/29 ,  G02B27/09 ,  G02B27/00

    Abstract: Optical beam shaping systems and methods can include an illumination source and a diffractive waveplate diffuser. The diffractive waveplate diffuser includes a layer of patterned optically anisotropic material. In one embodiment, the layer of patterned optically anisotropic material is fabricated in the form of patterned, optically anisotropic liquid crystal polymer. In another embodiment, the layer of patterned optically anisotropic material is a layer of liquid crystal, the diffractive waveplate diffuser also includes two alignment layers and two transparent conductive coatings, and the properties of the liquid crystal layer are controlled by the application of an electric potential between the two transparent conductive coatings. A method is provided for designing the alignment pattern of the layer of optically anisotropic material.

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