Cascaded Thermoelectric Cooling for Fast Laser Temperature Tuning
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Solution Overview
Problem
Conventional thermo-electric cooling (TEC) systems face limitations in achieving fast and accurate control over the operational temperature of electronic devices, particularly DFB lasers, due to constraints in heat pumping rate and thermal response time, which are influenced by the effective thermal mass and temperature differences between the hot and cold sides of the TEC.
Innovation Solution
A cascaded TEC system with at least two bi-directional heat pumps arranged in a cascade fashion, where the first heat pump is thermally coupled to the device to be cooled and the second heat pump maintains a low or negative temperature difference between its heat drain and source, reducing the effective thermal mass and enabling faster temperature tuning by controlling the thermal interface temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single TEC device is used for cooling, then the structure is simple, but the heat pumping rate is limited and temperature control accuracy is insufficient
Solution Approach 1:
The cooling system is divided into multiple independent TEC modules (first TEC, second TEC, third TEC) that operate in parallel. Each module handles a portion of the heat pumping load, enabling the system to achieve higher total heat pumping rates while maintaining manageable individual component complexity. The modular architecture allows independent optimization of each module.
2Temperature
If the temperature difference between hot and cold sides of TEC is increased, then the cooling capability is improved, but the thermal response time increases due to larger effective thermal mass
Solution Approach 1:
The thermal management system is segmented into multiple TEC modules with distributed thermal masses. By dividing the total thermal mass across multiple smaller modules rather than one large module, the system achieves the required temperature difference while reducing the effective thermal mass that must be heated or cooled, thereby improving thermal response time.
Solution Approach 2:
The system dynamically controls the operation of individual TEC modules based on real-time temperature requirements. By selectively activating or adjusting the power level of specific modules, the system can rapidly respond to temperature changes without being constrained by the thermal inertia of a large monolithic structure, thus reducing thermal response time while maintaining effective temperature differences.
3Productivity
If the heat pumping surface area is increased to achieve higher heat pumping rate, then the cooling capacity is improved, but the device size and thermal mass increase
Solution Approach 1:
Instead of using one large TEC device with extensive thermal mass, the system employs multiple smaller TEC modules distributed across the cooling surface. This segmentation achieves the required total heat pumping rate through parallel operation of compact modules, significantly reducing the overall device volume and effective thermal mass compared to a single large-scale solution.
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 allows for superior heat pumping rates, enabling fast and accurate temperature control of DFB lasers, reducing thermal response time and improving the ability to tune the output wavelength and frequency of THz radiation systems.
Implementation Method 1
Thermo-Electric Cooling (TEC) devices are devices which are generally based on thermo-electric (TE) heat pumps that use electrical energy to pump and transfer heat from first region(s) of a device to second region(s)
Implementation Method 2
heat spreader 120 for spreading the heat emitted through surface S1 onto the larger heat pumping surface S2
Implementation Method 3
maintains a low or negative temperature difference between its heat drain and source, reducing the effective thermal mass and enabling faster temperature tuning
Data Source
AI summary
A thermo-electric cooling (TEC) system is presented for cooling of a device, such a laser for example. The TECT system comprises first and second heat pumping assemblies, and a control unit associated at least with said second heat pumping assembly. Each heat pumping assembly has a heat source from which heat is pumped and a heat drain through which pumped heat is dissipated. The at least first and second heat pumping assemblies are arranged in a cascade relationship having at least one thermal interface between the heat source of the second heat pumping assembly and the heat drain of the first heat pumping assembly, the heat source of the first heat pumping assembly being thermally coupled to the electronic device which is to be cooled by evacuating heat therefrom. The control unit is configured and operable to carry out at least one of the following: (i) operating said second heat pumping assembly to provide a desired temperature condition such that temperature of the heat drain of said first heat pumping assembly is either desirably low or by a certain value lower than temperature of the heat source of said first heat pumping assembly; and (ii) operating said second heat pumping assembly to maintain predetermined temperature of said thermal interface.