Ceramic Microchannel Cooler for Laser Diode Thermal Management
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Solution Overview
Problem
Semiconductor laser diodes face thermal management issues due to high heat dissipation per unit area, leading to elevated junction temperatures and reduced efficiency and service life, with existing cooling systems requiring complex and expensive deionized water systems and being prone to erosion and corrosion, and lacking effective control and sensing mechanisms for individual emitters.
Innovation Solution
A ceramic microchannel cooler with integrated circuitry that uses ceramic sheets fused together to route coolant and provide electrical traces for controlling the laser diode, allowing for efficient heat extraction and electrical isolation, enabling the use of non-deionized water and providing fault-tolerant monitoring and control of individual emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If microchannel coolers made from copper are used to cool laser diodes, then heat extraction efficiency is improved, but the system becomes prone to erosion and corrosion requiring deionized water and expensive materials
Solution Approach 1:
The patent uses a copper core surrounded by a ceramic coating (such as aluminum oxide or aluminum nitride) to combine the high thermal conductivity of copper with the erosion and corrosion resistance of ceramic materials. This composite structure allows the use of non-deionized water coolant while maintaining efficient heat extraction from the laser diode.
2Power
If the packing density of individual laser diodes is increased to generate required input power, then power output is improved, but the space available for heat extraction decreases
Solution Approach 1:
The patent employs microchannel cooling technology where coolant flows through narrow channels in close proximity to the laser diode emitters, enabling highly efficient heat extraction from densely packed diodes. The microchannel structure provides large surface area for heat transfer within a compact volume, allowing high power density while maintaining effective cooling.
3Reliability
If additional devices are added to protect against failures or sense characteristics, then reliability is improved, but the compact packaging becomes more difficult
Solution Approach 1:
The patent integrates protective devices such as fuse elements and sensing elements directly into the cooler structure itself. The cooler serves multiple functions: thermal management, electrical isolation, and housing for protective components. This integration eliminates the need for separate protective devices, maintaining compact packaging while providing failure protection and sensing capabilities.
4Productivity
If laser diodes are packaged small to provide high output per unit area, then productivity is improved, but it becomes difficult to provide additional control or sensing devices
Solution Approach 1:
The cooler is designed as a multi-functional component that simultaneously provides thermal management, electrical isolation, mechanical support, and integration of control/sensing circuitry. By making the cooler universal in its functions, the patent eliminates the need for additional separate components, enabling compact packaging with high output density while incorporating necessary control and sensing capabilities.
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 ceramic microchannel cooler effectively manages heat, prevents catastrophic failures, and allows for compact, high-power laser diode arrays with enhanced cooling efficiency and reduced material degradation, while enabling the use of simple coolant systems and precise control over emitter performance.
Implementation Method 1
The cooler receives and routes a coolant from a cooling source via internal channels, preferably including impingement flow
Implementation Method 2
The use of non-conductive coolants eliminates the need for deionized water and allows the use of inexpensive, erosion and corrosion resistant materials
Data Source
AI summary
A laser diode package includes a laser diode, a cooler, and control circuitry, such as an integrated circuit. The laser diode is used for converting electrical energy to optical energy. The cooler receives and routes a coolant from a cooling source via internal channels. The cooler includes a plurality of ceramic sheets. The ceramic sheets are fused together. The ceramic sheets include traces or vias that provide electrically conductive paths to the integrated circuit. The control circuitry controls the output of the laser diode, e.g. the output at each of the laser diode's emitters. Multiple laser diode packages are placed together to form an array.