QCL Laser Module Thermal Interface for Compact Temperature Stability
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Solution Overview
Problem
The existing laser module faces challenges in reducing the size of the housing while enhancing the reliability through improved temperature control stability.
Innovation Solution
The laser module incorporates a mount member with specific mounting sections and a housing design where a medium with higher thermal conductivity than air is filled between the mount member and the bottom wall, enhancing heat dissipation and stabilizing temperature control without increasing the module's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling element such as a Peltier module is placed between the mount member and the bottom wall to enhance heat dissipation, then temperature control stability is improved, but the size of the housing increases due to space requirements for the cooling element and its wiring
Solution Approach 1:
A medium with higher thermal conductivity than air is introduced as an intermediary substance between the mount member and the bottom wall. This medium fills the gap and provides enhanced heat dissipation from the QCL element to the housing without requiring additional cooling components, thus improving temperature control stability while maintaining compact housing size.
Solution Approach 2:
The thermal conductivity parameter of the medium between the mount member and bottom wall is changed from air (low thermal conductivity) to a substance with higher thermal conductivity. This parameter change enables effective heat dissipation without adding cooling elements, resolving the contradiction between temperature control stability and housing size.
2Volume of stationary object
If the housing size is reduced to make the laser module more compact, then portability and space efficiency are improved, but temperature control stability deteriorates due to reduced space for heat dissipation
Solution Approach 1:
The thermal conductivity of the medium between the mount member and bottom wall is enhanced to compensate for the reduced housing volume. By changing this physical parameter, the system achieves effective heat dissipation in a compact form factor, simultaneously improving portability while maintaining temperature control stability.
Solution Approach 2:
The medium with high thermal conductivity is specifically placed in the critical heat dissipation path between the mount member and bottom wall, concentrating thermal management effectiveness in the most important location rather than requiring uniform cooling throughout the entire housing volume.
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 effectively improves the stability of temperature control within the laser module while maintaining a compact size, preventing excessive temperature rise and ensuring reliable operation.
Implementation Method 1
a medium having a higher thermal conductivity than air and filled between the second surface and the bottom wall
Data Source
AI summary
The laser module includes a housing with a bottom wall on which a mount member is placed, and accommodates a QCL element, a diffraction grating unit, a first lens holder, a second lens holder, and the mount member. The mount member includes a first mounting section for mounting the first lens holder, a second mounting section for mounting the QCL element and a temperature sensor, a third mounting section for mounting the second lens holder, and a fourth mounting section for mounting the diffraction grating unit. At least a second surface of the second mounting section facing the bottom wall is fixed to the bottom wall via a medium having a higher thermal conductivity than air and filled between the second surface and the bottom wall.