Heat dissipation and temperature control method for quantum cascade lasers in external cavity spectral beam combining systems

The thermal effects of quantum cascade lasers (QCLs) can cause wavelength locking instability and reduce output power in external cavity spectral beam combining (EC-SBC) systems. We propose a micro-channel structure (MCH) for heat dissipation and temperature control that rapidly stabilizes the QCL at 20.159°C, showing a linear relationship with the controlled temperature. Experimental comparisons demonstrate that MCH enhances the heat transfer rate within the structure, reducing the time required to stabilize and control QCL temperature. The output power and locked wavelength remain stable in the EC-SBC system under high currents. This study provides technical support for heat dissipation QCL arrays.