US 12,170,435 B2
Managing laser diode cavity thermal transients in HAMR disk drives
Erhard Schreck, San Jose, CA (US); Sukumar Rajauria, San Jose, CA (US); and Robert Smith, Washington, DC (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Aug. 10, 2023, as Appl. No. 18/447,989.
Claims priority of provisional application 63/492,802, filed on Mar. 29, 2023.
Prior Publication US 2024/0332893 A1, Oct. 3, 2024
Int. Cl. G11B 5/00 (2006.01); G11B 5/03 (2006.01); G11B 11/105 (2006.01); H01S 5/024 (2006.01); H01S 5/065 (2006.01)
CPC H01S 5/0651 (2013.01) [G11B 5/03 (2013.01); H01S 5/02453 (2013.01); G11B 2005/0021 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A data storage device, comprising:
one or more disks;
an actuator arm assembly comprising one or more magnetic recording heads;
at least one laser diode corresponding to the one or more magnetic recording heads; and
one or more processing devices configured to:
initiate a write operation, wherein initiating the write operation comprises:
activating a magnetic recording head corresponding to the at least one laser diode, and
applying a forward bias to at the least one laser diode;
apply a first reverse bias to the at least one laser diode during at least one intervening event, wherein the at least one intervening event comprises an event selected from a group consisting of a track seek event and a servo wedge crossing event; and
transition from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.