Recording head with transfer-printed laser diode unit formed of non-self-supporting layers
A recording head includes a substrate, a read transducer, a waveguide core, and a near-field transducer at an end of the waveguide core proximate a media-facing surface. The recording head includes a magnetic write pole and coil. A laser diode unit with one or more non-self-supporting layers of crystalline material region is transfer printed between layers of the recording head.
1. A method comprising:
transfer printing a laser diode unit onto a substrate used to form a recording head;
depositing at least one of a read transducer and part of a write transducer over the laser diode unit; and
forming a light coupler between the laser diode unit and a waveguide core of the write transducer.
2. The method of claim 1 , wherein the light coupler comprises at least one of a mirror, a grating, an assistant layer, and a gradient index lens.
3. The method of claim 1 , wherein depositing at least one of the read transducer and the part of write transducer over the laser diode unit comprises depositing, in order, the read transducer and the write transducer over the laser diode, and wherein the light coupler comprises a down-track light coupler.
4. The method of claim 3 , wherein the down-track light coupler is formed during a layering step between transfer printing the laser diode and depositing of the part of the write transducer.
5. The method of claim 3 , wherein the down-track light coupler comprises a first grating that directs light out of the laser diode unit and a second grating that receives the light at the waveguide core.
6. The method of claim 3 , wherein an active region of the laser diode is oriented so that light is emitted from the laser diode unit in a cross-track direction, the waveguide core being formed with a shape that redirects light from the cross-track direction to a direction normal to a media-facing surface of the recording head.
7. The method of claim 3 , wherein the laser diode is formed in close proximity to the substrate such that the substrate heat sinks the laser diode.
8. The method of claim 1 , wherein the depositing at least one of the read transducer and the part of write transducer over the laser diode unit comprises depositing a first return pole of the write transducer over the laser diode unit, the method further comprising depositing the read transducer and a second return pole of the write transducer on the substrate before transfer printing the laser.
9. The method of claim 8 , wherein an active laser region of the laser diode region is deposited at or below the waveguide core.
10. The method of claim 9 , wherein the active region is oriented so that light is emitted from the laser diode unit in a cross-track direction, the waveguide core being formed with a shape that redirects light from the cross-track direction to a direction normal to a media-facing surface of the recording head.
11. The method of claim 9 , wherein the active region is oriented so that light is emitted from the laser diode unit in a direction normal to a media-facing surface of the recording head.
12. A method, comprising
transfer printing a laser diode unit onto a substrate used to form a recording head;
depositing, in order, a read transducer and a write transducer over the laser diode;
forming a down-track light coupler between the laser diode unit and a waveguide core of the write transducer.
13. The method of claim 12 , wherein the down-track light coupler is formed during a layering step between transfer printing the laser diode and depositing of the part of the write transducer.
14. The method of claim 12 , wherein the down-track light coupler comprises a first grating that directs light out of the laser diode unit and a second grating that receives the light at the waveguide core.
15. The method of claim 12 , wherein an active region of the laser diode is oriented so that light is emitted from the laser diode unit in a cross-track direction, the waveguide core being formed with a shape that redirects light from the cross-track direction to a direction normal to a media-facing surface of the recording head.
16. The method of claim 12 , wherein the laser diode is formed in close proximity to the substrate such that the substrate heat sinks the laser diode.
17. A method comprising:
depositing, in order on a substrate, a read transducer and a return pole of a write transducer;
transfer printing a laser diode unit over the return pole;
depositing a waveguide core of the write transducer over the laser diode unit; and
forming a light coupler between the laser diode unit and the waveguide core.
18. The method of claim 17 , wherein an active laser region of the laser diode region is deposited at or below the waveguide core.
19. The method of claim 18 , wherein the active region is oriented so that light is emitted from the laser diode unit in a cross-track direction, the waveguide core being formed in a shape that redirects light from the cross-track direction to a direction normal to a media-facing surface of the recording head.
20. The method of claim 18 , wherein the active region is oriented so that light is emitted from the laser diode unit in a direction normal to a media-facing surface of the recording head.