Quantum Cascade Laser Stacked Mesa Structure for Heat Dissipation
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Solution Overview
Problem
The challenge is to create a quantum cascade semiconductor laser with a thick core layer and cladding layer for enhanced optical output, while avoiding the fabrication burdens and performance limitations imposed by forming high mesa structures.
Innovation Solution
A quantum cascade laser integrated device is designed with a covering region that includes a current blocking semiconductor region and a conductivity-type semiconductor region, featuring a stacking arrangement of upper and lower semiconductor mesas to achieve desired thicknesses for the core and cladding layers, along with an insulating layer and groove structure for heat dissipation and light confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thick core layer and cladding layer are formed to enhance optical output, then optical confinement is improved, but fabrication complexity and difficulty increase due to high mesa structure requirements
Solution Approach 1:
The device is divided into multiple independent semiconductor mesas (first and second lower mesas, first and second upper mesas) that can be fabricated separately and then integrated. This segmentation allows each mesa to have optimized thickness for optical confinement without requiring the entire structure to be formed as a single high mesa, thereby reducing fabrication difficulty while maintaining optical output performance.
2Illumination intensity
If a thick core layer and cladding layer are formed to enhance optical output, then optical confinement is improved, but device complexity increases due to high mesa structure
Solution Approach 1:
The device is divided into multiple independent semiconductor mesas (first and second lower mesas, first and second upper mesas) that can be fabricated separately and then integrated. This segmentation allows each mesa to have optimized thickness for optical confinement without requiring the entire structure to be formed as a single high mesa, thereby reducing fabrication difficulty while maintaining optical output performance.
Solution Approach 2:
The patent transitions from a vertical high-mesa structure to a stacked horizontal arrangement of multiple lower mesas with a covering region. This dimensional reorganization achieves the required optical confinement thickness through vertical stacking of separate mesas rather than forming a single tall mesa, simplifying the overall device architecture.
3Reliability
If heat dissipation is improved through structural modifications, then device reliability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The current blocking semiconductor region is integrated into the covering region that also serves as a structural element for optical confinement. This merging of heat dissipation function (current blocking) with structural function (covering region) allows heat management to be achieved without adding separate complex heat dissipation structures, maintaining ease of manufacture while enhancing reliability.
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 configuration allows for improved optical confinement and heat dissipation, enabling higher optical output without the fabrication burdens of high mesa structures, thus enhancing the performance of the quantum cascade semiconductor laser.
Implementation Method 1
a current blocking semiconductor region embedding the first lower semiconductor mesa and the second lower semiconductor mesa
Implementation Method 2
the first lower semiconductor mesa and the second lower semiconductor mesa each including a core layer for quantum cascading
Implementation Method 3
the first conductivity-type semiconductor region including an upper cladding region
Data Source
AI summary
A quantum cascade laser integrated device includes: first and second lower semiconductor mesas extending in a direction of a first axis; a covering region disposed on top and side faces of the first and second lower semiconductor mesas, and including first and second upper semiconductor mesas, the first and second upper semiconductor mesas extending in the direction of the first axis on the first and second lower semiconductor mesas, respectively; and first and second electrodes respectively disposed on the upper semiconductor mesas, the first lower semiconductor mesa and the second lower semiconductor mesa each including a quantum cascading core layer, the covering region including a current blocking semiconductor region embedding the first and second lower semiconductor mesas, and a first conductivity-type semiconductor region disposed on the first and second lower semiconductor mesas and the current blocking semiconductor region, and the first conductivity-type semiconductor region including an upper cladding region.