Semiconductor Laser Element Window Region Design for COD Prevention
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Solution Overview
Problem
Semiconductor laser elements face degradation due to catastrophic optical damage (COD) caused by strong light densities, and existing methods struggle to effectively manage light-emitting facets, leading to inefficient laser light output and short device lifespan.
Innovation Solution
A semiconductor laser element design incorporating a semiconductor layer portion with a window region and a non-window region, where the window region has a higher band gap energy achieved through atomic vacancy diffusion, utilizing a first impurity to suppress and a second impurity to promote diffusion, with specific doping concentrations and annealing processes to maintain optical waveguide layer disordering and prevent COD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window region is formed to prevent catastrophic optical damage, then reliability is improved, but manufacturing precision deteriorates due to difficulty in controlling atomic vacancy diffusion
Solution Approach 1:
A first impurity layer is introduced as an intermediary substance between the promoting film and the semiconductor layer. This first impurity suppresses atomic vacancy diffusion, preventing excessive disordering in the window region while still allowing sufficient diffusion to maintain the energy gap difference. This mediator enables precise control over the disordering process, resolving the contradiction between preventing COD and maintaining manufacturing precision.
Solution Approach 2:
The invention changes the parameter of impurity concentration distribution by forming a first impurity layer with specific concentration gradients. By controlling the concentration and distribution of the first impurity (which suppresses diffusion) alongside the second impurity (which promotes diffusion), the patent achieves precise control over atomic vacancy diffusion depth and intensity, thereby maintaining both reliability and manufacturing precision.
2Reliability
If atomic vacancy diffusion is promoted to increase band gap energy in window region, then reliability is improved, but device complexity increases due to multiple impurity layers and annealing processes
Solution Approach 1:
The first impurity layer serves multiple functions simultaneously: it suppresses excessive atomic vacancy diffusion, maintains the energy gap difference in the window region, and prevents degradation of the semiconductor layer structure. This multi-functional approach achieves reliability improvement without requiring excessively complex device structures, as the first impurity layer performs multiple protective and control roles.
3Productivity
If strong light density is used for high-power laser output, then productivity is improved, but catastrophic optical damage occurs reducing reliability
Solution Approach 1:
The patent applies preliminary anti-action by forming a window region with increased band gap energy through controlled atomic vacancy diffusion before the laser operates. This pre-formed protective region with higher energy gap resists the harmful effects of strong light density and hot carriers, preventing catastrophic optical damage even when high-power laser output is generated. The protective structure is prepared in advance to counteract the potential harm of high-intensity operation.
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 solution effectively prevents catastrophic optical damage, ensuring stable and prolonged high-intensity laser light output by maintaining a sufficient energy gap difference between the window and non-window regions, enhancing the reliability and longevity of the semiconductor laser element.
Implementation Method 1
a first impurity having a function of suppressing atomic vacancy diffusion
Implementation Method 2
a second impurity having a function of promoting atomic vacancy diffusion
Implementation Method 3
performing a predetermined thermal treatment after depositing a promoting film
Data Source
AI summary
A semiconductor optical element includes a semiconductor layer portion that includes an optical waveguide layer. The semiconductor layer portion contains a first impurity having a function of suppressing atomic vacancy diffusion and a second impurity having a function of promoting atomic vacancy diffusion, between a topmost surface of the semiconductor layer portion and the optical waveguide layer. The semiconductor layer portion includes two or more regions that extend in a deposition direction. At least one of the two or more regions contains both the first impurity and the second impurity. The two or more regions have different degrees of disordering in the optical waveguide layer achieved through atomic vacancy diffusion and different band gap energies of the optical waveguide layer.