HAMR recording head with external cavity laser using a near-field transducer as a reflector
AssigneeSeagate Technology LLC
InventorsVivek Krishnamurthy, Scott Eugene Olson, Tyler Lenn Perry, John Charles Duda
Life of this patent
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Abstract
An external cavity laser of a recording head includes a channel waveguide that delivers light towards a media-facing surface of the recording head. The laser includes an externally mounted part with an active region having a longitudinal axis corresponding to a light propagation direction of the channel waveguide. The externally mounted part has a reflective back facet and anti-reflective front facet. The laser includes a near-field transducer at an end of the channel waveguide proximate the media facing surface. The reflective back facet and the near-field transducer define a resonator of the external cavity laser.
Claims19
An external cavity laser of a recording head, comprising:
- a channel waveguide that delivers light towards a media-facing surface of the recording head;
- an externally mounted part comprising an active region having a longitudinal axis corresponding to a light propagation direction of the channel waveguide, the externally mounted part comprising a reflective back facet and anti-reflective front facet;
- and
- a near-field transducer at an end of the channel waveguide proximate the media facing surface, the near-field transducer comprising a plate structure and a peg extending from the plate structure towards the media-facing surface, the reflective back facet and the near-field transducer defining a resonator of the external cavity laser, wherein the near-field transducer reflects no more than 15% of the light back towards the externally mounted part.
An external cavity laser of a recording head, comprising:
- a channel waveguide that delivers light towards a media-facing surface of the recording head;
- an externally mounted part comprising an active region having a longitudinal axis corresponding to a light propagation direction of the channel waveguide, the externally mounted part comprising a reflective back facet and anti-reflective front facet;
- a near-field transducer at an end of the channel waveguide proximate to a media-facing surface;
- and
- a Bragg grating within the channel waveguide and having a longitudinal axis defined along the light propagation direction, the Bragg grating separated from the near-field transducer by 5 μm or less.
Dependencies are inferred from the claim text.