Chuck System for Sub-Micron Alignment of Laser Diode Chips
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Solution Overview
Problem
Heat assisted magnetic recording (HAMR) technology faces challenges in achieving high throughput attachment and sub-micron alignment of components, particularly in the bonding process of semiconductor laser diode chips and sub-mounts, leading to inefficient energy transfer due to poor alignment.
Innovation Solution
The use of a chuck system with specific material characteristics, such as silicon carbide and sapphire layers, combined with a vacuum nozzle and alignment features, enables high accuracy and throughput in the bonding process by ensuring precise alignment and efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bonding processes are used for laser diode chip attachment, then manufacturing simplicity is maintained, but alignment accuracy deteriorates leading to poor sub-micron alignment
Solution Approach 1:
The patent introduces a chuck as an intermediary device with integrated alignment features (alignment marks, reference surfaces) and material layers (silicon carbide, sapphire, plastic shim) that mediate between the bonding process and the components. This intermediary provides precise sub-micron alignment through its structured surface features while managing thermal and mechanical stresses during bonding.
Solution Approach 2:
The patent changes material parameters by selecting specific materials with distinct properties: silicon carbide for thermal conductivity and structural stability, sapphire for optical transparency and hardness, and plastic shim for stress management. These parameter changes enable precise alignment and controlled bonding conditions.
2Loss of energy
If higher laser power is used to compensate for poor alignment, then energy transfer efficiency deteriorates, but alignment tolerance is improved
Solution Approach 1:
The patent implements feedback through alignment marks and reference surfaces on the chuck that enable verification and adjustment of component positions. This feedback mechanism ensures sub-micron alignment accuracy, optimizing energy transfer efficiency by preventing misalignment losses without requiring excessive laser power.
3Manufacturing precision
If bonding process duration is extended to achieve better alignment, then productivity decreases, but alignment accuracy improves
Solution Approach 1:
The patent applies preliminary action by pre-positioning alignment marks and reference surfaces on the chuck before component attachment. This preliminary preparation enables rapid alignment during the bonding process, achieving sub-micron precision without extending process duration, thereby maintaining high productivity.
4Temperature
If chuck system materials are not optimized for thermal management, then temperature control deteriorates, but manufacturing simplicity is maintained
Solution Approach 1:
The patent employs composite materials in the chuck system: silicon carbide layer for thermal conductivity and structural stability, sapphire layer for optical transparency and thermal management, and plastic shim for stress management. This composite structure optimizes temperature control during laser bonding while managing the complexity through integrated material selection.
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 solution enhances the alignment accuracy and reduces the need for higher laser power, resulting in improved energy efficiency and longer bonding process duration without significant degradation of the chuck system.
Implementation Method 1
a vacuum nozzle configured to apply a vacuum pressure to hold the first component
Implementation Method 2
an assembly heating element configured to heat the first component to a temperature sufficient to bond the first component to the second component
Implementation Method 3
a chuck system with specific material characteristics, such as silicon carbide and sapphire layers
Data Source
AI summary
Systems and devices for achieving high throughput attachment of sub-micron alignment of components are provided. One such device can include a fixture for holding a chuck, the fixture including a plurality of alignment features for adjusting a position of the chuck, the chuck includes a top layer including a vacuum aperture for holding a first component and a bottom layer made from a translucent material, wherein the bottom layer is directly attached to the top layer.