Ridge Semiconductor Laser Layout for Heat Dissipation and Current Control
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Solution Overview
Problem
Edge-emitting semiconductor lasers face challenges in heat dissipation, leading to a decrease in output due to heat generation, as existing insulating layers may not effectively transfer heat while preventing current paths at other locations.
Innovation Solution
A semiconductor laser design featuring a strip-shaped ridge with a high-resistance region at its foot, an insulating layer on both side surfaces, and an electrode layer on the upper surface, which facilitates heat transfer through the high-resistance region, improving dissipation while preventing current flow at other locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is provided to cover the side surface and foot of the ridge, then current paths are prevented at locations other than the ridge, but heat dissipation is reduced
Solution Approach 1:
The insulating layer is selectively positioned only on the side surfaces of the ridge, leaving the foot of the ridge exposed. This local differentiation allows the insulating layer to prevent current paths on the side surfaces while the exposed foot region provides a thermal conduction path for heat dissipation. The insulating layer does not completely cover the foot of the ridge, creating a localized thermal pathway.
Solution Approach 2:
The insulating layer is divided into multiple segments: it covers the side surfaces of the ridge but intentionally leaves gaps or exposed regions at the foot of the ridge. This segmentation allows different portions of the ridge to serve different functions - the covered side surfaces prevent current leakage while the exposed foot regions facilitate heat conduction to the substrate.
2Reliability
If the insulating layer covers the foot of the ridge, then current paths are prevented, but heat transfer from the active layer to the electrode layer is reduced
Solution Approach 1:
The insulating layer is applied with local quality differentiation - it covers the side surfaces where current path prevention is critical, but deliberately leaves the foot of the ridge exposed or partially exposed. This localized insulation strategy ensures that heat transfer pathways through the foot region remain open while current leakage on the side surfaces is prevented.
3Temperature
If heat dissipation is improved by exposing the high-resistance region, then laser output is maintained, but current may flow at locations other than the ridge
Solution Approach 1:
The insulating layer is strategically positioned on the side surfaces of the ridge where current path control is most critical, while leaving the foot of the ridge exposed for heat dissipation. The high-resistance region is formed specifically at the foot of the ridge to provide both thermal conduction and electrical isolation, creating a localized functional differentiation that simultaneously addresses heat dissipation and current path control.
Solution Approach 2:
The high-resistance region acts as an intermediary element at the foot of the ridge, providing both thermal conduction pathways for heat dissipation and electrical resistance to prevent current leakage. This intermediary region mediates between the conflicting requirements of heat transfer and current path control, allowing heat to flow while blocking unwanted current paths.
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
Enhanced heat dissipation is achieved, maintaining laser output by effectively transferring heat generated in the active layer to the electrode layer via the high-resistance region, while preventing current paths at locations other than the ridge.
Implementation Method 1
a heat generated in the active layer is transferred to the electrode layer through the upper surface of the ridge and the high-resistance region
Implementation Method 2
the insulating layer is formed so as to be in contact with both side surfaces of the ridge and to expose at least a portion of the high-resistance region
Data Source
AI summary
A semiconductor laser according to one embodiment of the present disclosure includes: a first semiconductor layer; an active layer; and a second semiconductor layer stacked on the first semiconductor layer with the active layer interposed therebetween, and having a strip-shaped ridge, and a high-resistance region at a foot of the ridge. The semiconductor laser further includes an insulating layer formed so as to be in contact with both side surfaces of the ridge in a width direction of the ridge and to expose at least a portion of the high-resistance region, and an electrode layer in contact with an upper surface of the ridge, and in contact with all or a part of an exposed portion of the high-resistance region which is not covered with the insulating layer.