Distributed Feedback Laser EAMR Transducer Alignment
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Solution Overview
Problem
Conventional energy-assisted magnetic recording (EAMR) disk drives face challenges with optical efficiency, misalignment issues, and inadequate heat dissipation, leading to high costs, lower performance, and manufacturability problems.
Innovation Solution
The EAMR disk drive incorporates a distributed feedback (DFB) laser with quantum wells, a laser coupling grating, and a near-field transducer, along with reflective gratings to enhance optical efficiency and heat dissipation, using wafer level integration for precise alignment and improved manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser diode and slider alignment is used, then the system can function, but misalignments occur leading to increased insertion loss and reduced optical efficiency
Solution Approach 1:
The patent integrates the laser diode and slider into a single integrated transducer assembly, eliminating separate alignment requirements. The laser diode is positioned in close proximity to the slider's air-bearing surface, with the optical path directly coupled to the waveguide, thereby merging previously separate components that required precise alignment into one unitized structure.
Solution Approach 2:
The patent introduces a waveguide as an intermediary component that directly receives light from the laser diode and channels it to the media. This waveguide acts as a mediator that eliminates the need for precise free-space optical alignment between the laser diode and media, as the light is confined and guided through the waveguide structure.
2Power
If conventional laser diode is used, then the system can operate, but heat dissipation becomes problematic at higher powers
Solution Approach 1:
The patent extracts the heat-generating laser diode from the conventional slider assembly and positions it in a separate location with dedicated thermal management. The laser diode is mounted on a heat sink or thermally conductive substrate that is thermally isolated from the slider's air-bearing surface, allowing high-power operation without overheating the recording media or slider.
Solution Approach 2:
The patent replaces conventional thermal conduction through the slider structure with a dedicated thermal management system using thermally conductive materials and heat sink structures. This substitution allows for more efficient heat removal from the laser diode without relying on the slider's mechanical structure, enabling higher power operation.
3Loss of energy
If conventional EAMR transducer design is used, then the system can function, but optical efficiency and performance suffer
Solution Approach 1:
The patent employs a dynamic optical coupling system where the laser diode's optical output is dynamically adjusted and directed into the waveguide. The system includes adjustable coupling mechanisms that optimize light transfer efficiency based on operating conditions, allowing the transducer to adapt to variations in laser output and maintain high optical efficiency.
Solution Approach 2:
The patent uses composite material structures in the transducer design, including semiconductor laser materials, dielectric waveguide materials, and magnetic recording media with specific composite structures. These composite materials are engineered to optimize optical confinement, reduce losses, and enhance the overall efficiency of the energy-assisted magnetic recording process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances performance, reduces costs, and improves manufacturability by achieving high power delivery with efficient heat dissipation and alignment precision, resulting in higher yield and reliability.
Implementation Method 1
at least one distributed feedback (DFB) laser and at least one EAMR transducer on the slider. The DFB laser(s) each includes a plurality of quantum wells... The DFB laser(s) for providing energy to the media
Implementation Method 2
a laser coupling grating... The grating(s) include a coupling grating for coupling the energy from the at least one DFB laser to the waveguide(s)
Implementation Method 3
The waveguide(s) direct the energy from the at least one grating toward the ABS
Implementation Method 4
The light from the laser diode 30 is then provided to a waveguide. The waveguide directs the light toward the conventional media 12, heating a small region of the conventional media 12
Data Source
AI summary
A method and system for providing an energy assisted magnetic recording (EAMR) disk drive are described. The EAMR disk drive includes a media, a slider having a trailing face and an air-bearing surface (ABS), at least one distributed feedback (DFB) layer and EAMR transducer(s) on the slider. The DFB laser(s) each includes a plurality of quantum wells, a laser coupling grating, at least one reflector, and a cavity in the at least one DFB laser. The DFB laser(s) for providing energy to the media. The EAMR transducer(s) includes at least one waveguide, a write pole, at least one coil for energizing the write pole, at least one grating, and may include a near-field transducer. The grating(s) include a coupling grating for coupling the energy from the at least one DFB laser to the waveguide(s). The waveguide(s) direct the energy from the at least one grating toward the ABS.