Surface-Emitting Laser Structure for Current-Lens Alignment
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Solution Overview
Problem
Conventional surface emitting lasers face challenges in suppressing position shift between the center of the current constriction region and the center of the lens-shaped part in plan view, leading to increased diffraction loss.
Innovation Solution
The surface emitting laser design includes a semiconductor structure with a convex-shaped part that protrudes towards the second reflection mirror side, featuring a lens-shaped part that meets the convex-shaped part on the top layer, thereby aligning their centers and reducing position shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional surface emitting laser uses a separate lens-shaped part and current constriction region, then the manufacturing process is simplified, but position shift between the center of the current constriction region and the center of the lens-shaped part increases
Solution Approach 1:
The patent combines the lens-shaped part and current constriction region into a single integrated structure. The convex-shaped part serves dual functions: it forms the lens-shaped part for optical confinement and simultaneously defines the current constriction region through its geometric shape, eliminating the need for separate components and their alignment
Solution Approach 2:
The convex-shaped part performs multiple functions within a single structure: it acts as both the optical lens element and the current confinement structure. This multi-functional design eliminates the separate lens-shaped part while maintaining both optical and electrical functions
2Power
If the resonator length is increased to achieve higher output, then the laser power increases, but diffraction loss increases due to position shift between current constriction region and lens-shaped part
Solution Approach 1:
By merging the lens-shaped part and current constriction region into one integrated convex-shaped part, the patent eliminates position misalignment that causes diffraction loss, enabling longer resonator lengths to be used without penalty from misalignment losses
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 suppresses position shift between the current constriction region and the lens-shaped part, reducing diffraction loss and allowing for increased resonator length to achieve higher output.
Implementation Method 1
suppress position shift between the center of the current constriction region and the center of the lens-shaped part, leading to increased diffraction loss
Implementation Method 2
first and second reflection mirrors; and a semiconductor structure that is disposed between the first and second reflection mirrors
Data Source
AI summary
There is provided a surface emitting laser that can suppress position shift between the center of a current constriction region and the center of a lens-shaped part in plan view.The surface emitting laser according to the present technology includes: first and second reflection mirrors; and a semiconductor structure that is disposed between the first and second reflection mirrors, and the semiconductor structure internally includes a convex-shaped part to which a current constriction region is set, and that protrudes toward a side of the second reflection mirror, and includes a lens-shaped part that meets the convex-shaped part on a top layer on the side of the second reflection mirror. According to the present technology, it is possible to provide the surface emitting laser that can suppress position shift between the center of the current constriction region and the center of the lens-shaped part in plan view.