Surface-Emitting Laser Stack With Tunnel Junction and Oxide Confinement
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Solution Overview
Problem
Conventional surface emitting lasers experience a decrease in luminous efficiency, which needs to be suppressed.
Innovation Solution
A surface emitting laser design that includes first and second multilayer film reflectors, a plurality of active layers, a tunnel junction between adjacent active layers, and an oxide confinement layer between an active layer and the tunnel junction, optimizing the position and arrangement of these components to enhance current and light confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional surface emitting laser structure with a single active layer is used, then the device complexity is low, but the luminous efficiency decreases
Solution Approach 1:
The patent divides the active layer into multiple discrete active layers (first active layer, second active layer, third active layer) separated by tunnel junctions and oxide confinement layers. This segmentation allows independent optimization of each active layer's light emission characteristics while maintaining overall device functionality, thereby improving luminous efficiency through better current and light confinement in each segment.
Solution Approach 2:
The patent implements a nested structure where oxide confinement layers are positioned between active layers and tunnel junctions, creating concentric functional zones. The tunnel junctions are nested between the oxide confinement layers, forming a multi-layered configuration where each layer serves a specific function (current injection, light confinement, active emission), thereby enhancing overall luminous efficiency through improved spatial organization.
2Loss of energy
If multiple active layers are added to improve luminous efficiency, then the energy loss is reduced, but the device complexity increases
Solution Approach 1:
The patent merges multiple functional elements into a unified vertical structure where active layers, tunnel junctions, and oxide confinement layers are stacked in an integrated configuration. This merging approach allows the device to achieve improved luminous efficiency through multiple active layers while managing complexity by combining current injection, confinement, and light emission functions into a single cohesive structure rather than separate components.
Solution Approach 2:
The oxide confinement layers serve as intermediary elements positioned between the active layers and tunnel junctions. These intermediary layers provide critical functions of current and light confinement without directly participating in active light emission, thereby enabling the multiple active layers to work more efficiently while the intermediaries manage the complexity of interfacing between different functional zones.
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
The proposed design effectively suppresses the decrease in luminous efficiency by efficiently confining current and light, thereby improving the overall performance of the surface emitting laser.
Implementation Method 1
an oxide confinement layer disposed between one active layer of the two adjacent active layers and the tunnel junction
Implementation Method 2
a tunnel junction disposed between two active layers adjacent to each other in a lamination direction among the plurality of active layers
Implementation Method 3
first and second multilayer film reflectors; a plurality of active layers laminated together between the first and second multilayer film reflectors
Data Source
AI summary
The present technology provides a surface emitting laser capable of suppressing a decrease in luminous efficiency.The present technology provides a surface emitting laser including: first and second multilayer film reflectors; a plurality of active layers laminated together between the first and second multilayer film reflectors; a tunnel junction disposed between two active layers adjacent to each other in a lamination direction among the plurality of active layers; and an oxide confinement layer disposed between one active layer of the two adjacent active layers and the tunnel junction. According to the present technology, it is possible to provide a surface emitting laser capable of suppressing a decrease in luminous efficiency.