Laser mode hop compensation using multi-sector feedback in heat assisted magnetic recording

A method of operating a data storage device, comprising:

• applying a laser bias to a laser diode of the data storage device during a write operation, wherein the data storage device comprises:
• a disk,
• a read/write head configured to read data from and write data to the disk,
• the laser diode coupled to a nearfield transducer configured to heat an area of the disk near the read/write head,
• a first resistive temperature detector (RTD), and
• a second RTD;
• obtaining a plurality of differential signal measurements, based at least in part on a plurality of measurements from each of the first RTD and the second RTD;
• and
• adjusting the laser bias applied to the laser diode, based at least in part on comparing the plurality of differential signal measurements to a target value for the differential signal.

One or more processing devices, comprising:

• means for applying, during a write operation, a laser bias to a laser diode of a data storage device, wherein the data storage device comprises:
• a disk,
• a read/write head configured to read data from and write data to the disk,
• the laser diode coupled to a nearfield transducer configured to heat an area of the disk near the read/write head,
• a first resistive temperature detector (RTD), and
• a second RTD;
• means for obtaining a plurality of differential signal measurements, based at least in part on obtaining a plurality of measurements from each of the first RTD and the second RTD;
• means for determining a target value for a differential signal, wherein the differential signal is associated with the first RTD and the second RTD;
• and
• means for adjusting the laser bias applied to the laser diode, based at least in part on:
• comparing the plurality of differential signal measurements to the target value for the differential signal;
• and
• one or more of a plurality of sensitivity adjustments, comprising (1) a differential signal measurement to thermal fly height control (TFC) sensitivity, and (2) a thermal fly height control (TFC) to laser bias correction sensitivity.