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Sensorless monitoring of laser power instability in a heat-assisted magnetic recording head
Sensorless monitoring of laser power instability in a heat-assisted magnetic recording head
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机译:热辅助磁记录头中激光功率不稳定性的无传感器监视
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摘要
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.
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