公开(公告)号：US11422237B2

公开(公告)日：2022-08-23

申请号：US16248555

申请日：2019-01-15

Applicant: Seagate Technology LLC

Inventor： Dan Mohr ,  Zoran Jandric ,  Kevin A. Gomez ,  Raghu Ambekar Ramachandra Rao

IPC: G01S7/481 ,  G02B26/12

Abstract: An apparatus includes a detector and a light source configured to emit light. The apparatus further includes a disk with a set of prisms and that is configured to rotate, arranged to receive and direct the emitted light, and arranged to receive and direct backscattered light. The apparatus further includes a reflecting apparatus with multiple reflective facets and configured to rotate, arranged to reflect the emitted light, and arranged to reflect the backscattered light. A focusing apparatus is arranged to focus the backscattered light from the disk towards the detector.

公开(公告)号：US11320367B1

公开(公告)日：2022-05-03

申请号：US17066562

申请日：2020-10-09

Applicant: Seagate Technology LLC

Inventor： Raghu Ambekar Ramachandra Rao ,  Aaron Edward Patz ,  Tae-Woo Lee

IPC: G01N21/21 ,  G01N21/39 ,  G11B5/455 ,  G11B5/00

Abstract: A testing system includes a production-type laser having optical modes of a production laser that interfaces with an optical path of a heat-assisted magnetic recording (HAMR) slider. A far-field light illumination path delivers excitation light from the production-type laser to the optical path of the HAMR slider, the excitation light being emitted from an air bearing surface (ABS) of the HAMR slider. Optics receive the emitted light from the ABS and distribute the emitted light to one or more sensors. The system determines, based on signals received from the one or more sensors, a depolarization of the emitted light and a coupling efficiency of the HAMR slider. The system may also measure light reflecting out of the optical path and Fourier transform these measurements to determine locations of reflections within the optical path.

公开(公告)号：US20200174103A1

公开(公告)日：2020-06-04

申请号：US16206831

申请日：2018-11-30

Applicant: Seagate Technology LLC

Inventor： Kevin A. Gomez ,  Zoran Jandric ,  Krishnan Subramanian ,  Pierre Asselin ,  Dan Mohr ,  Raghu Ambekar Ramachandra Rao

IPC: G01S7/481 ,  G02B26/10 ,  G02B26/12 ,  G01S17/10

Abstract: An apparatus includes a detector, a light source configured to emit light, a reflecting apparatus having multiple reflective facets, and a mirror. The reflecting apparatus is configured to rotate around an axis and arranged to reflect the emitted light from the light source and reflect backscattered light. The mirror is arranged to reflect the backscattered light from the reflecting apparatus towards the detector.

公开(公告)号：US20220276353A1

公开(公告)日：2022-09-01

申请号：US17747823

申请日：2022-05-18

Applicant: Seagate Technology LLC

Inventor： Dan Mohr ,  Zoran Jandric ,  Kevin A. Gomez ,  Raghu Ambekar Ramachandra Rao

IPC: G01S7/481 ,  G02B26/12

Abstract: An apparatus includes a detector and a light source configured to emit light. The apparatus further includes a disk with a set of prisms and that is configured to rotate, arranged to receive and direct the emitted light, and arranged to receive and direct backscattered light. The apparatus further includes a reflecting apparatus with multiple reflective facets and configured to rotate, arranged to reflect the emitted light, and arranged to reflect the backscattered light. A focusing apparatus is arranged to focus the backscattered light from the disk towards the detector.

公开(公告)号：US20200225328A1

公开(公告)日：2020-07-16

申请号：US16248555

申请日：2019-01-15

Applicant: Seagate Technology LLC

Inventor： Dan Mohr ,  Zoran Jandric ,  Kevin A. Gomez ,  Raghu Ambekar Ramachandra Rao

IPC: G01S7/481 ,  G02B26/12

Abstract: An apparatus includes a detector and a light source configured to emit light. The apparatus further includes a disk with a set of prisms and that is configured to rotate, arranged to receive and direct the emitted light, and arranged to receive and direct backscattered light. The apparatus further includes a reflecting apparatus with multiple reflective facets and configured to rotate, arranged to reflect the emitted light, and arranged to reflect the backscattered light. A focusing apparatus is arranged to focus the backscattered light from the disk towards the detector.