Surface-Emitting Laser Crystal Layout for Light and Current Confinement
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Solution Overview
Problem
Existing surface emitting lasers face challenges in improving their characteristics, particularly in controlling light emission and current confinement efficiently.
Innovation Solution
A surface emitting laser design incorporating a first crystal layer with distinct partial regions of varying dopant concentrations and refractive indices, along with a second crystal layer featuring structured arrangements, to enhance light control and current confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional surface emitting laser structure is used, then the device is simple to manufacture, but the light emission control and current confinement are insufficient
Solution Approach 1:
The first crystal layer is divided into a first partial region and a second partial region with different dopant concentrations and refractive indices. This segmentation allows different regions to perform different functions: the first partial region provides high refractive index for light confinement, while the second partial region provides low refractive index for controlled light emission, thereby improving light emission control without requiring entirely new structures
Solution Approach 2:
Different regions of the first crystal layer are assigned different local properties through varying dopant concentrations. The first partial region has higher dopant concentration and higher refractive index, while the second partial region has lower dopant concentration and lower refractive index. This local quality differentiation enables precise control of light emission and current confinement in specific areas
2Reliability
If photonic crystals are added to improve laser characteristics, then light control improves, but manufacturing complexity increases
Solution Approach 1:
The patent combines the photonic crystal structure with the first crystal layer into a single integrated layer rather than adding them as separate components. The first crystal layer simultaneously serves as both the photonic crystal structure and the cladding layer, eliminating the need for additional manufacturing steps to add separate photonic crystal layers while still achieving improved light control
Solution Approach 2:
The first crystal layer performs multiple functions simultaneously: it acts as a photonic crystal for light control, as a cladding layer for current confinement, and as a structural component of the laser device. This multi-functionality reduces the overall number of components and manufacturing steps while achieving multiple performance improvements
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 design allows for efficient control of light emission and current flow, resulting in improved laser characteristics and performance.
Implementation Method 1
a refractive index of the first region is higher than a refractive index of the second partial region
Data Source
AI summary
According to one embodiment, a surface emitting laser includes first and second electrodes, a light emitting layer, and first and second crystal layers. The light emitting layer is provided between the first electrode and the second electrode. The first crystal layer is provided between the light emitting layer and the second electrode. The first crystal layer includes a first partial region and a second partial region. The second crystal layer includes a plurality of structures. At least a part of the plurality of structures is arranged in a second direction crossing a first direction from the first electrode to the second electrode. The plurality of structures are provided between the light emitting layer and the first partial region in the first direction. At least a part of the second partial region is provided between the plurality of structures in the second direction.