Semiconductor Laser Array Electrode Configuration
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Solution Overview
Problem
The existing array type semiconductor laser devices experience a shift in the flow of current through the active layer due to the arrangement of p-side and n-side electrodes, leading to a misalignment of the light-emitting point towards the n-side electrode.
Innovation Solution
The semiconductor laser device is designed with a configuration where the first and second semiconductor laser elements are disposed on a substrate, with specific electrode arrangements and conductors connecting them in series, ensuring a uniform current flow orthogonal to the direction of the waveguides, thereby reducing the shift of the light-emitting point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If p-side and n-side electrodes are arranged in conventional configuration, then series connection of laser elements is achieved, but current flow shifts toward n-side electrode causing light-emitting point misalignment
Solution Approach 1:
The patent applies asymmetry by positioning n-side electrodes at both lateral ends of the semiconductor laser element rather than symmetrically at opposite sides. This asymmetric arrangement, combined with conductors connecting n-side electrodes to adjacent p-side electrodes, creates a current path that flows orthogonally through the active layer without lateral shift, resolving the alignment problem while maintaining series connection
Solution Approach 2:
The patent introduces conductors as intermediary elements that connect n-side electrodes to adjacent p-side electrodes. These conductors act as mediators to guide the current flow through the active layer in an orthogonal direction, preventing the current from shifting toward the n-side electrode and ensuring proper light-emitting point alignment
2Use of energy by moving object
If current is injected in series into light-emitting element regions, then driving current is reduced, but current flow through active layer shifts toward n-side electrode
Solution Approach 1:
The asymmetric electrode arrangement with n-side electrodes at lateral ends and conductors connecting to adjacent p-side electrodes creates a uniform orthogonal current path through the active layer. This maintains series connection benefits of reduced driving current while ensuring uniform current distribution without lateral shift
Solution Approach 2:
The conductor connections between n-side and p-side electrodes create equipotential paths that guide current flow uniformly through the active layer. This equipotential arrangement ensures that current distributes evenly across the light-emitting element regions, maintaining both energy efficiency and flow uniformity
Data Source
AI summary
An array type semiconductor laser device includes: a second electrode (p-electrode) disposed on another conductivity type semiconductor layer; a third electrode (n-electrode) disposed on a one conductivity type semiconductor layer and between a first electrode (p-electrode) and the second electrode; a fifth electrode (n-electrode) disposed on the one conductivity type semiconductor layer and between the third electrode and the second electrode; a sixth electrode (n-electrode) disposed on the one conductivity type semiconductor layer and across from the fifth electrode; a first conductor (wire) that electrically connects the second electrode and the third electrode; and a second conductor (n-wiring) that electrically connects the fifth electrode and the sixth electrode.