Laser Feedback Suppressor for Heat-Assisted Magnetic Recording
AssigneeSeagate Technology LLC
InventorsAidan Dominic Goggin, John Moloney, Reyad Mehfuz, Chuan Zhong, Christopher Neil Harvey
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Abstract
A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.
Claims20
A recording head, comprising:
- a channel waveguide that delivers light to a media-facing surface;
- a near-field transducer (NFT) at an end of the channel waveguide and proximate to the media-facing surface;
- and
- a laser comprising an active region having a longitudinal axis corresponding to a propagation direction of the channel waveguide, the active region comprising a back facet and a front facet proximate the NFT, the front facet having a surface shape configured to suppress back reflection of the light, the surface shape of the front facet comprising one or both of a convex shape and a concave shape.
A recording head, comprising:
- a channel waveguide that delivers light to a media-facing surface;
- a near-field transducer (NFT) at an end of the channel waveguide and proximate to the media-facing surface;
- and
- a laser comprising an active region having a longitudinal axis corresponding to a propagation direction of the channel waveguide, the active region comprising a back facet and a front facet proximate the NFT, the front facet having a surface shape configured to suppress back reflection of the light, the surface shape of the front facet comprising a curved shape and one or both of a convex shape and a concave shape.
A recording head, comprising:
- a channel waveguide that delivers light to a media-facing surface;
- a near-field transducer (NFT) at an end of the channel waveguide and proximate to the media-facing surface;
- and
- a laser comprising an active region having a longitudinal axis corresponding to a propagation direction of the channel waveguide, the active region comprising a back facet and a front facet proximate the NFT, the front facet having a surface shape configured to suppress back reflection of the light, the surface shape of the front facet comprising a curved shape.
The recording head of claim 14, wherein the curved shape is off centered with respect to the longitudinal axis.
Dependencies are inferred from the claim text.