Thermal management of laser diode mode hopping for heat assisted media recording
AssigneeSeagate Technology LLC
InventorsKarim Tatah, Mourad Benakli, James Gary Wessel
Life of this patent
Estimating the term…
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.
Claims20
(canceled)
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.