公开(公告)号：US10366722B1

公开(公告)日：2019-07-30

申请号：US15978432

申请日：2018-05-14

Applicant: Seagate Technology LLC

Inventor： Riyan Mendonsa ,  James Dillon Kiely ,  Joshua Ward Christensen ,  Jon D. Trantham ,  Chad Robert Barry ,  Tim Rausch

IPC: G11B11/00 ,  G11B7/1263 ,  G11B5/00 ,  G11B7/1267 ,  G11B5/60 ,  G11B7/126

Abstract: An apparatus comprises a laser diode configured to generate modulated light during a write operation in response to receiving modulated current having a mean amplitude that varies or is constant. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A writer heater of the slider is configured to receive power during the write operation having a magnitude that varies or is constant. A sensor is situated on or within the slider. The sensor is configured to produce a sensor signal representative of output optical power of the laser diode. Measuring circuitry is coupled to the sensor and configured to measure a change in the sensor signal indicative of a laser mode hop during the write operation.