GaN Semiconductor Laser Electrode Segmentation for Damage Prevention
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Solution Overview
Problem
GaN-based semiconductor laser devices of the multi-electrode type face issues with damage in the region of the third portion of the second electrode and the saturable absorption region due to high light intensity and electric field concentration, affecting long-term reliability.
Innovation Solution
A semiconductor laser device with a ridge stripe structure and a second electrode configuration that separates the electrode into distinct portions to manage light intensity and electric field distribution, ensuring the ratio of average widths of the electrode portions and the distance from the light emission region to the saturable absorption region are optimized to prevent excessive light intensity and electric field concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second electrode is configured with a third portion applying electric field to the saturable absorption region, then the semiconductor laser device can perform self-pulsation operation, but damage occurs in the third portion and saturable absorption region due to high light intensity and electric field concentration
Solution Approach 1:
The second electrode is divided into three distinct portions: a first portion for applying forward bias to the first light emission region, a second portion for applying forward bias to the second light emission region, and a third portion for applying reverse bias to the saturable absorption region. This segmentation allows independent control of electrical fields in different functional regions, enabling self-pulsation operation while managing light intensity and electric field distribution to prevent damage.
Solution Approach 2:
Different portions of the second electrode are designed with different electrical characteristics to create localized electric field distributions. The first and second portions create forward bias conditions for light emission, while the third portion creates reverse bias for saturable absorption. This local differentiation of electrical properties enables the device to achieve self-pulsation while controlling harmful concentration effects in specific regions.
2Power
If the first light emission region has higher light intensity compared to the second light emission region, then laser light can be emitted effectively, but damage is caused in the region of the third portion that faces the first light emission region
Solution Approach 1:
The second electrode is segmented into three portions with the third portion positioned to face the saturable absorption region. This segmentation creates a controlled reverse bias electric field in the third portion that counteracts the high light intensity from the first light emission region, preventing damage while maintaining effective laser emission.
Solution Approach 2:
The third portion of the second electrode acts as an intermediary element that applies a reverse bias electric field to the saturable absorption region. This intermediary electric field controls the interaction between high-intensity light from the first light emission region and the saturable absorption region, preventing damage by modulating carrier injection and absorption dynamics.
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 optimized configuration reduces the likelihood of damage in the saturable absorption region and the third portion of the second electrode, enhancing the long-term reliability and performance of the semiconductor laser device by suppressing excessive light intensity and electric field concentration.
Implementation Method 1
a third compound semiconductor layer formed of a GaN-based compound semiconductor, the third compound semiconductor layer configuring a first light emission region, a second light emission region, and a saturable absorption region
Implementation Method 2
a first compound semiconductor layer having a first conductivity type and being formed of a GaN-based compound semiconductor, a third compound semiconductor layer formed of a GaN-based compound semiconductor, the third compound semiconductor layer configuring a first light emission region, a second light emission region
Data Source
AI summary
A bi-section type GaN-based semiconductor laser device that has a configuration and a structure in which damage is less likely to be caused in a region in a saturable absorption region that faces a first light emission region is provided. The semiconductor laser device includes a first light emission region, a second light emission region, a saturable absorption region sandwiched by the foregoing light emission regions, a first electrode, and a second electrode. Laser light is emitted from an end face on a second light emission region side thereof. The second electrode is configured of a first portion, a second portion, and a third portion. 1<W2-ave/W1-ave is satisfied where W1-ave is an average width of a portion having a ridge stripe structure of the first portion and W2-ave is an average width of a portion having a ridge stripe structure of the second portion.