Seagate Technology Incorporated

Cymer, Inc.

Andrei Dorobantu

Declan Macken

Todd Michael Lammers

Karim Tatah

Tyler Lenn Perry

Jon David Trantham

John Charles Duda

James Dillon Kiely

Patrick Carl Fletcher

Tim Rausch

Kevin M O'Brien

Joshua Jon Thornes

Matthew Graham

Thomas C Zirps

Shreyas Bhaban

A system includes an optical source configured to emit a pulsed light beam, the optical source comprising one or more chambers, each of the one or more chambers configured to hold a gaseous gain medium, the gaseous gain medium being associated with an assumed gas life; at least one detection module configured to: receive and analyze data related to the pulsed light beam, and produce a beam quality metric based on the data related to the pulsed light beam; and a monitoring module configured to: analyze the beam quality metric, determine a health status of the gaseous gain medium based on the analysis of the beam quality metric, and produce a status signal based on the determined health status, the status signal indicating whether to extend use of the gaseous gain medium beyond the assumed gas life or to end use of the gaseous gain medium.

Gas monitoring system

An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

Laser power monitoring in a heat-assisted magnetic recording device using a resistive sensor and high-frequency laser modulation

A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.

Sensorless monitoring of laser power instability in a heat-assisted magnetic recording head

An optical lithography system is monitored. Information is received from the optical lithography system; a rule is accessed, the rule being associated with one or more of an event in the optical lithography system and an amount of time; a module stored in a library of modules is identified based on the accessed rule; whether a particular condition exists in the optical lithography system is determined using the identified module and the information received from the optical lithography system; and if the particular condition exists, a command signal is generated based on one or more characteristics of the particular condition and provided to an optical source of the optical lithography system. The command signal is based on the determined particular condition, and the command signal is sufficient to change one or more operating parameters of the optical source.

Monitoring system for an optical lithography system

First and second repeatable runout (ZAP) values are both located on a first virtual track of a magnetic disk. The first ZAP value is offset from the first virtual track center in a first direction and the second ZAP value is offset from the first virtual track center in a second direction opposite the first direction. At least one of the first and second ZAP values are accessed when performing repeatable runout correction for a writer of the read/write head that is being positioned over a second virtual track of the magnetic disk.

Using two or more offset repeatable runout correction values for a virtual track of a magnetic disk

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San Diego, CA, United States of America

Andrei Dorobantu