Patent ID: 11908499
Assignee: SEAGATE TECHNOLOGY LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A heat-assisted magnetic recording head comprising:
a laser configured to emit electromagnetic radiation;
a near-field transducer configured to focus and emit an optical near-field;
a primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer, a first end of the primary waveguide being adjacent to the laser and a second end of the primary waveguide being adjacent to the near-field transducer;
a secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide; and
a 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, the secondary waveguide further configured to mitigate reflections of the electromagnetic radiation from reaching the photodiode,
wherein a segment of the primary waveguide that comprises the first end is coupled to a coupler that is configured to direct electromagnetic radiation emitted by the laser into the primary waveguide, the coupler including a curved optical feature that is configured to disperse stray electromagnetic radiation.