GRATING BASED LASER AND POWER MONITOR FOR A HEAT-ASSISTED MAGNETIC RECORDING DEVICE

摘要

A head assembly includes a submount, a body with a first surface, an optical path, a near field transducer (NFT), a sensor, and a laser. The optical path is disposed in the body and is adapted to receive light and convey the light to a distal end of the waveguide. The near field transducer (NFT) is disposed adjacent the distal end of the waveguide and has an output end proximate the first surface of the body. The sensor interfaces with the submount and the laser is attached to the submount along a non-primary lasing surface. The laser is adapted to inject light into the waveguide and includes a grating adapted to diffract a portion of the light through the non-primary lasing surface to the sensor.

主权项

1. A head assembly, comprising:
a submount; a body having a first surface; an optical path disposed in the body and adapted to receive light and convey the light to a distal end of the optical path; a near field transducer (NFT) disposed adjacent the distal end of the optical path and having an output end proximate the first surface of the body; a sensor interfacing with the submount; and a laser attached to the submount along a non-primary lasing surface thereof, wherein the laser is adapted to inject light into the optical path and includes a grating adapted to diffract a portion of the light through the non-primary lasing surface to the sensor.