Thermal management of laser diode mode hopping for heat assisted media recording
AssigneeSeagate Technology LLC
InventorsKarim Tatah, Mourad Benakli, James Gary Wessel
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Abstract
A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.
Claims19
An apparatus, comprising:
- a slider configured to facilitate heat assisted magnetic recording (HAMR);
- a laser diode disposed in the slider;
- a read element and a write element respectively situated at an air bearing surface (ABS) of the slider;
- a near-field transducer (NFT) situated at the ABS proximate the write element;
- an optical waveguide configured to couple light from the laser diode to the NFT;
- and
- a heater comprising a resistive element disposed in, along, or adjacent the laser diode and configured to heat the laser diode during at least a portion of a non-lasing state of the laser diode and at least a portion of a lasing state of the laser diode.
An apparatus, comprising:
- a slider configured to facilitate heat assisted magnetic recording (HAMR);
- a laser diode disposed in the slider;
- a read element and a write element respectively situated at an air bearing surface (ABS) of the slider;
- a near-field transducer (NFT) situated at the ABS proximate the write element;
- an optical waveguide configured to couple light from the laser diode to the NFT;
- a heater comprising a resistive element disposed in, along, or adjacent the laser diode;
- and
- a controller coupled to the slider and the laser diode, the controller comprising:
- a laser control coupled to the laser diode and configured to control operation of the laser diode;
- and
- a heater control coupled to the heater and configured to control operation of the heater, the heater control configured to control the heater to heat the laser diode during at least a portion of a non-lasing state of the laser diode and at least a portion of a lasing state of the laser diode.
Dependencies are inferred from the claim text.