公开(公告)号：US11320367B1

公开(公告)日：2022-05-03

申请号：US17066562

申请日：2020-10-09

Applicant: Seagate Technology LLC

Inventor： Raghu Ambekar Ramachandra Rao ,  Aaron Edward Patz ,  Tae-Woo Lee

IPC: G01N21/21 ,  G01N21/39 ,  G11B5/455 ,  G11B5/00

Abstract: A testing system includes a production-type laser having optical modes of a production laser that interfaces with an optical path of a heat-assisted magnetic recording (HAMR) slider. A far-field light illumination path delivers excitation light from the production-type laser to the optical path of the HAMR slider, the excitation light being emitted from an air bearing surface (ABS) of the HAMR slider. Optics receive the emitted light from the ABS and distribute the emitted light to one or more sensors. The system determines, based on signals received from the one or more sensors, a depolarization of the emitted light and a coupling efficiency of the HAMR slider. The system may also measure light reflecting out of the optical path and Fourier transform these measurements to determine locations of reflections within the optical path.