Semiconductor Laser Diode Heat-Dissipating Layer Thermal Lens Control
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Solution Overview
Problem
High-power semiconductor laser diodes, particularly for fiber coupling applications, are limited by their beam quality, which is often characterized by a high beam parameter product (BPP) due to limited control over the emission angle and thermal management, leading to inefficiencies in optical output power coupling into optical fibers.
Innovation Solution
A high-power semiconductor laser diode design featuring a heat-dissipating layer with high thermal conductivity, strategically positioned and structured to enhance thermal dissipation, particularly in the region of the radiation output surface, while maintaining efficient electrical contacting, thereby reducing the beam parameter product by minimizing thermal lens effects and self-focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional edge emitters with broad stripe lasers are used, then high optical output power can be achieved, but beam quality deteriorates due to high beam parameter product
Solution Approach 1:
The patent applies local quality by implementing a heat-dissipating layer with spatially varying thermal conductivity. The layer has higher thermal conductivity in regions closer to the active region and lower thermal conductivity in outer regions. This localized variation in thermal properties enables precise control of heat flow patterns, reducing thermal lens effects in critical areas while maintaining overall beam quality and high optical output power simultaneously.
2Manufacturing precision
If heat sinks with water cooling are used to reduce divergence angle, then beam quality improves, but device complexity increases
Solution Approach 1:
The patent implements self-service by integrating heat dissipation functionality directly into the laser diode structure through the heat-dissipating layer. This layer, positioned adjacent to the active region, provides passive thermal management by conducting heat away from critical areas without requiring external water cooling systems. The structure serves its own thermal management needs, reducing divergence angle and improving beam quality while avoiding the complexity of separate cooling systems.
3Temperature
If thermal conductivity is increased in the contact layer region, then heat dissipation improves, but charge carrier injection efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality through a heat-dissipating layer with non-uniform thermal conductivity distribution. The layer exhibits higher thermal conductivity in regions adjacent to the active region for effective heat dissipation, while maintaining lower thermal conductivity in outer regions to preserve charge carrier injection efficiency. This spatially differentiated approach allows simultaneous optimization of both thermal management and electrical performance.
4Manufacturing precision
If the resonator is lengthened to improve beam quality, then divergence angle reduces, but device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical approach of lengthening the resonator with a thermal field-based solution. Instead of increasing the physical length of the resonator to reduce divergence, the invention uses a heat-dissipating layer to control thermal lens effects and manage heat flow. This substitution of thermal management for mechanical modification reduces device complexity and size while maintaining improved beam quality.
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 significantly improves the beam quality and optical output power coupling efficiency into optical fibers, reducing thermal resistance and maintaining homogeneous charge carrier injection, leading to enhanced performance and cost advantages in fiber input coupling systems.
Implementation Method 1
a heat-dissipating layer (4), which is arranged in regions on a side of the contact layer (3) facing away from the active region (20)
Data Source
AI summary
The invention relates to a semiconductor laser diode (1) comprising: —a semiconductor layer sequence (2) having an active region (20) provided for generating radiation; —a radiation decoupling surface (10) which extends perpendicular to a main extension plane of the active region; —a main surface (11) which delimits the semiconductor layer sequence in the vertical direction; —a contact layer (3) which adjoins the main surface; and —a heat-dissipating layer (4), regions of which are arranged on a side of the contact layer facing away from the active region, wherein the contact layer is exposed in places for external electrical contact of the semiconductor laser diode. The invention also relates to a semiconductor component.