Energy assisted magnetic recording disk drive using a distributed feedback laser
View Patent ↗A method and system for providing an energy assisted magnetic recording (EAMR) disk drive are described. The EAMR disk drive includes a media, a slider having a trailing face and an air-bearing surface (ABS), at least one distributed feedback (DFB) layer and at least one EAMR transducer on the slider. The DFB laser(s) each includes a plurality of quantum wells, a laser coupling grating, at least one reflector, and a cavity in the at least one DFB laser. The DFB laser(s) for providing energy to the media. The EAMR transducer(s) includes at least one waveguide, a write pole, at least one coil for energizing the write pole, at least one grating, and may include a near-field transducer. The grating(s) include a coupling grating for coupling the energy from the at least one DFB laser to the waveguide(s). The waveguide(s) direct the energy from the at least one grating toward the ABS.
1. An energy assisted magnetic recording (EAMR) disk drive including a media comprising:
a slider having a trailing face and an air-bearing surface (ABS);
at least one distributed feedback (DFB) laser including a plurality of quantum wells, a first mirror, a laser coupling grating, at least one reflector, and a cavity in the at least one DFB laser, the plurality of quantum wells residing between the first mirror and the cavity, the at least one DFB laser for providing energy to the media; and
at least one EAMR transducer on the slider, the at least one EAMR transducer including at least one waveguide, a write pole, at least one coil for energizing the write pole, a second mirror and at least one grating, a coupling grating of the at least one grating for coupling the energy from the at least one DFB laser to the at least one waveguide, the at least one waveguide directing the energy from the at least one grating toward the ABS, the at least one waveguide residing between the second mirror and the cavity.
2. The EAMR disk drive of claim 1 wherein at least one grating further includes a reflecting grating, the coupling grating residing between the ABS and the reflecting grating.
3. The EAMR disk drive of claim 1 wherein the at least one reflector includes first reflecting grating between the ABS and the laser coupling grating and a second reflecting grating, the laser coupling grating residing between the second reflecting grating and the ABS.
4. The EAMR disk drive of claim 1 wherein the laser coupling grating is a second order surface couple grating.
5. The EAMR disk drive of claim 4 wherein the at least one reflector further includes at least one of a mirror and a reflecting grating residing between the ABS and the laser coupling grating.
6. The EAMR disk drive of claim 1 wherein the laser coupling grating is a first surface couple grating and wherein the coupling grating is a second surface couple grating.
7. The EAMR disk drive of claim 1 further comprising:
a near-field transducer (NFT) for focusing the energy from the at least one waveguide onto the media.
8. The EAMR disk drive of claim 1 wherein the at least one waveguide further directs reflected energy from the ABS to the coupling grating.
9. The EAMR disk drive of claim 1 further comprising:
an antireflective coating residing at an edge of the cavity.
10. An energy assisted magnetic recording (EAMR) disk drive including a media comprising:
a slider having a trailing face and an air-bearing surface (ABS);
at least one distributed feedback (DFB) laser including a plurality of quantum wells, a second order surface coupling grating, a cavity in the at least one DFB laser, a first mirror and at least one reflector, the at least one DFB laser for providing energy to the media, the at least one reflector residing between the ABS and the cavity, the cavity residing between the trailing face and the mirror and having an antireflective coating at a cavity edge; and
at least one EAMR transducer on the slider, the at least one EAMR transducer including at least one waveguide, a write pole, at least one coil for energizing the write pole, a reflecting grating, a near-field transducer, a second mirror, and a surface coupling grating for coupling the energy from the at least one DFB laser to the at least one waveguide, the at least one waveguide for directing the energy from the surface coupling grating toward the ABS and for directing reflected energy from the ABS to the surface coupling grating, the surface coupling grating residing between the ABS and the reflecting grating, the (NFT) for focusing the energy from the at least one waveguide onto the media, the at least one waveguide residing between the second mirror and the cavity.