Semiconductor Laser Polarization Control via Oxidized Region Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Surface emitting semiconductor lasers face challenges in controlling the polarization direction of light due to stress generated from oxidized regions, which can lead to defects and instability in laser characteristics.
Innovation Solution
A semiconductor laser design with a laminated body structure featuring distinct oxidized regions, where the width of the oxidized regions in different parts is carefully controlled to generate stress in a predetermined direction, stabilizing the polarization of light emitted from the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the oxidized region is increased to generate sufficient stress for polarization control, then the polarization stability is improved, but the stress-induced defects in the resonance portion increase
Solution Approach 1:
The patent applies local quality by creating different oxidized region widths at different locations: wider oxidized regions (W1, W2) at the first and second parts, and narrower oxidized regions (W3) at the third part. This spatial variation in oxidized region width allows the first and second parts to generate sufficient stress for polarization control while the third part maintains lower stress to prevent defects in the resonance portion.
Solution Approach 2:
The patent segments the oxidized region into three distinct parts with different width characteristics. The first part has oxidized region width W1, the second part has oxidized region width W2, and the third part has oxidized region width W3. This segmentation allows independent optimization of stress generation (at first and second parts) and stress reduction (at third part) to simultaneously achieve polarization stability and defect prevention.
2Object-affected harmful factors
If the width of the oxidized region is decreased to reduce stress and prevent defects, then the stress-induced defects are reduced, but the polarization control capability is weakened
Solution Approach 1:
The patent applies local quality by creating different oxidized region widths at different locations: wider oxidized regions (W1, W2) at the first and second parts for polarization control, and narrower oxidized regions (W3) at the third part for defect prevention. This spatial variation allows each region to have optimized properties for its specific function.
Solution Approach 2:
The patent segments the oxidized region into three distinct parts with different width characteristics. The first part has oxidized region width W1, the second part has oxidized region width W2, and the third part has oxidized region width W3. This segmentation allows independent optimization of stress generation (at first and second parts) and stress reduction (at third part) to simultaneously achieve polarization stability and defect prevention.
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 design effectively reduces stress-induced defects and maintains stable polarization of light, enhancing the semiconductor laser's performance and longevity.
Implementation Method 1
The oxidized region is formed by replacing the arsenic in the Al0.9Ga0.1As layer with oxygen
Implementation Method 2
the volume shrinks at this time. Therefore, when the width of the oxidized region of the laminated body is large, a large stress is generated in the resonance portion by the oxidized region
Data Source
AI summary
A semiconductor laser including: a first mirror layer; a second mirror layer; an active layer, a current confinement layer, a first region, and a second region, in which the first mirror layer, the second mirror layer, the active layer, the current confinement layer, the first region, and the second region constitute a laminated body, the first region and the second region constitute an oxidized region of the laminated body, in a plan view, the laminated body includes a first part, a second part, and a third part disposed between the first part and the second part and resonating light generated in the active layer, and in a plan view, at least at a part of the third part, W1>W3 and W2>W3, W1 is a width of the oxidized region of the first part, W2 is a width of the oxidized region of the second part, and W3 is a width of the oxidized region of the third part.