公开(公告)号：US20200348371A1

公开(公告)日：2020-11-05

申请号：US16879575

申请日：2020-05-20

Applicant: University of Southampton

Inventor： Rand Ismaeel ,  Ali Masoudi ,  Martynas Beresna ,  Gilberto Brambilla

IPC: G01R33/032 ,  G02F1/01 ,  G02F1/00 ,  G02F1/095

Abstract: A magnetic field sensor comprises a magnetically responsive light propagating component configured to cause a polarization of light propagating inside the component to be rotated in response to an applied magnetic field, wherein the magnetically responsive light propagating component is formed of a bulk material doped with a dopant, the dopant including at least gadolinium, the dopant concentration being at a sufficiently low concentration such that the dopant is uniformly dispersed in the bulk material to provide a high Verdet constant. The magnetic field sensor also comprises a detector, and a polarization-maintaining light input device to couple the light into the magnetically responsive light propagating component. The detector is configured to measure a property of light output from the magnetically responsive light propagating component to determine a change in polarization of the light, the change caused by the presence of a magnetic field.

公开(公告)号：US20140153097A1

公开(公告)日：2014-06-05

申请号：US14115300

申请日：2012-05-03

Applicant: UNIVERSITY OF SOUTHAMPTON

Inventor： Martynas Beresna ,  Peter Kazansky

IPC: G02B5/30

CPC classification number: G02B5/3083 ,  G02B5/1809 ,  G02B27/286

Abstract: This patent describes an optical element, which converts incident linearly or circularly polarized visible light into radially or azimuthally polarized light beam. The polarization converter is a single optical element, produced by direct laser writing technique in an optically transparent substrate. Direct laser writing based on ultra-short pulsed laser radiation forms form birefringence self-assembled nanogratings in optically transparent material, such as fused silica. The period of gratings is smaller than wavelengths of a visible light.

Abstract translation: 该专利描述了一种光学元件，其将入射的线性或圆偏振的可见光转换成径向或方位偏振的光束。 偏振转换器是通过直接激光写入技术在光学透明基板中产生的单个光学元件。 基于超短脉冲激光辐射的直接激光写入在诸如熔融二氧化硅的光学透明材料中形成双折射自组装纳米光栅。 光栅的周期小于可见光的波长。

公开(公告)号：US11754644B2

公开(公告)日：2023-09-12

申请号：US16879575

申请日：2020-05-20

Applicant: University of Southampton

Inventor： Rand Ismaeel ,  Ali Masoudi ,  Martynas Beresna ,  Gilberto Brambilla

IPC: G01R33/032 ,  G02F1/00 ,  G02F1/01 ,  G02F1/09 ,  G02F1/095

CPC classification number: G01R33/0322 ,  G02F1/0036 ,  G02F1/0136 ,  G02F1/093 ,  G02F1/0955 ,  G02F2202/06

Abstract: A magnetic field sensor comprises a magnetically responsive light propagating component configured to cause a polarization of light propagating inside the component to be rotated in response to an applied magnetic field, wherein the magnetically responsive light propagating component is formed of a bulk material doped with a dopant, the dopant including at least gadolinium, the dopant concentration being at a sufficiently low concentration such that the dopant is uniformly dispersed in the bulk material to provide a high Verdet constant. The magnetic field sensor also comprises a detector, and a polarization-maintaining light input device to couple the light into the magnetically responsive light propagating component. The detector is configured to measure a property of light output from the magnetically responsive light propagating component to determine a change in polarization of the light, the change caused by the presence of a magnetic field.

公开(公告)号：US20210033430A1

公开(公告)日：2021-02-04

申请号：US16996373

申请日：2020-08-18

Applicant: University of Southampton

Inventor： Andrei Donko ,  Ali Masoudi ,  Martynas Beresna ,  Gilberto Brambilla

IPC: G01D5/353 ,  G01H9/00

Abstract: A sensor system includes a radiation source, an optical fiber, and a detection device. The radiation source is arranged to emit pulses of radiation. The optical fiber comprises a first end and a core. The first end is arranged to receive pulses of radiation output from the radiation source such that, in use, the pulses of radiation are coupled into the fiber. The core is arranged to support propagation of the pulses of radiation along the fiber. The core includes a plurality of reflectors each comprising a portion of the core having a refractive index which is different to the refractive index of adjacent regions of the core. Reflections of a pulse of radiation from adjacent reflectors output at the first end of the fiber are resolvable from each other in the time domain. The detection device is arranged to measure radiation output from the first end of the fiber and resolve radiation reflected at different locations in the core of the fiber.

公开(公告)号：US12259263B2

公开(公告)日：2025-03-25

申请号：US16996373

申请日：2020-08-18

Applicant: University of Southampton

Inventor： Andrei Donko ,  Ali Masoudi ,  Martynas Beresna ,  Gilberto Brambilla

IPC: G02B6/124 ,  G01D5/353 ,  G01H9/00 ,  G02B6/02 ,  G02B6/12

Abstract: A sensor system includes a radiation source, an optical fiber, and a detection device. The radiation source is arranged to emit pulses of radiation. The optical fiber comprises a first end and a core. The first end is arranged to receive pulses of radiation output from the radiation source such that, in use, the pulses of radiation are coupled into the fiber. The core is arranged to support propagation of the pulses of radiation along the fiber. The core includes a plurality of reflectors each comprising a portion of the core having a refractive index which is different to the refractive index of adjacent regions of the core. Reflections of a pulse of radiation from adjacent reflectors output at the first end of the fiber are resolvable from each other in the time domain. The detection device is arranged to measure radiation output from the first end of the fiber and resolve radiation reflected at different locations in the core of the fiber.