公开(公告)号：US11908499B1

公开(公告)日：2024-02-20

申请号：US17809722

申请日：2022-06-29

Applicant: Seagate Technology LLC

Inventor： Mark Gubbins ,  Christopher Neil Harvey ,  Aidan Goggin ,  Fadi El Hallak ,  Reshma Anamari Mohandas ,  Bryn John Howells ,  Scott Eugene Olson

IPC: G11B5/09 ,  G11B5/60 ,  G11B5/31 ,  G11B13/08 ,  G11B7/126 ,  G11B5/48 ,  G11B5/00

CPC classification number: G11B5/6088 ,  G11B5/314 ,  G11B5/4866 ,  G11B7/126 ,  G11B13/08 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording head includes a laser, a near-field transducer, a primary waveguide, a secondary waveguide, and a photodiode. The laser is configured to emit electromagnetic radiation. The near-field transducer is configured to focus and emit an optical near-field. The primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide. The photodiode configured to receive the portion of the electromagnetic radiation from the secondary waveguide and emit a signal that represents a magnitude of the electromagnetic radiation that the laser emits.

公开(公告)号：US20240112696A1

公开(公告)日：2024-04-04

申请号：US18537957

申请日：2023-12-13

Applicant: Seagate Technology LLC

Inventor： Mark Anthony Gubbins ,  Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Fadi El Hallak ,  Reshma Anamari Mohandas ,  Bryn John Howells ,  Scott Eugene Olson

IPC: G11B5/60 ,  G11B5/31 ,  G11B5/48 ,  G11B7/126 ,  G11B13/08

CPC classification number: G11B5/6088 ,  G11B5/314 ,  G11B5/4866 ,  G11B7/126 ,  G11B13/08 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording head includes a laser, a near-field transducer, a primary waveguide, a secondary waveguide, and a photodiode. The laser is configured to emit electromagnetic radiation. The near-field transducer is configured to focus and emit an optical near-field. The primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide. The photodiode configured to receive the portion of the electromagnetic radiation from the secondary waveguide and emit a signal that represents a magnitude of the electromagnetic radiation that the laser emits.

公开(公告)号：US12236986B2

公开(公告)日：2025-02-25

申请号：US18537957

申请日：2023-12-13

Applicant: Seagate Technology LLC

Inventor： Mark Anthony Gubbins ,  Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Fadi El Hallak ,  Reshma Anamari Mohandas ,  Bryn John Howells ,  Scott Eugene Olson

IPC: G11B5/09 ,  G11B5/31 ,  G11B5/48 ,  G11B5/60 ,  G11B7/126 ,  G11B13/08 ,  G11B5/00

Abstract: A heat-assisted magnetic recording head includes a laser, a near-field transducer, a primary waveguide, a secondary waveguide, and a photodiode. The laser is configured to emit electromagnetic radiation. The near-field transducer is configured to focus and emit an optical near-field. The primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide. The photodiode configured to receive the portion of the electromagnetic radiation from the secondary waveguide and emit a signal that represents a magnitude of the electromagnetic radiation that the laser emits.