IN IN223DE2015A
In one embodiment, a device includes a laser unit configured to produce laser light, the laser unit having a laser resonator with a length in a direction parallel to laser light emission and a slider having a length in a direction perpendicular to a media-facing surface of the slider, the slider including a main magnetic pole configured, to write data to a magnetic medium, a near-field light-generating element configured to produce near-field light when laser light is provided thereto to assist the main magnetic pole in writing data to the magnetic medium by heating a local region of the magnetic medium, and a waveguide configured for guiding the laser light to the element, the waveguide including a cladding surrounding a core, wherein an interval of a longitudinal mode of the laser resonator is equal to within about 5% of an integer multiplier of an optical interference period of the waveguide.
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