Patent · US Active

Data storage device detecting lasing threshold of laser by measuring protrusion effect

US9786310B1 · kind B1 · utility

5Cited by

27References

18Claims

0Family size

Assignee

Western Digital Technologies, Inc. · US

Inventors

Hans J. Richter · Marktoberdorf, DE
Robert E. Eaton · San Jose, US
Andreas Moser · Cugnaux, FR

Key dates

Filing date	Jun 6, 2017
Grant date	Oct 10, 2017
Priority date	—
Expiry date	Jun 6, 2037

Classification

Technology area (CPC G)Physics
CPC primaryG11B2005/0021
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. At least four different laser powers are applied to the laser and a fly height of the head over the disk is measured at each laser power. A lasing threshold power for the laser is detected based on the measured fly heights.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.