研究目的
Investigating the effect of active region heating on dynamic and power characteristics of quantum cascade lasers emitting at a wavelength of 4.8 μm at room temperature.
研究成果
The study demonstrates significant heating of the QCL active region during pump pulses, affecting both dynamic and power characteristics. Optimization of the heterostructure and laser chip construction is suggested to improve output power.
研究不足
The study highlights the significant heating of the active region during the pump pulse, which limits the output power of QCLs at room temperature. The turn-on delay observed exceeds theoretical estimates, suggesting a need for better understanding of carrier dynamics in the QCL active region.
1：Experimental Design and Method Selection:
The study involved the fabrication and analysis of stripe quantum cascade lasers (QCLs) emitting near
2：8 μm at room temperature. The methodology included molecular-beam epitaxy (MBE) for heterostructure growth, photolithography for stripe formation, and pulsed pumping for dynamic and power characteristics analysis. Sample Selection and Data Sources:
QCL heterostructures were grown on n-InP(100):Sn substrates doped to 2 × 1017 cm–
3：The active region consisted of 30 periods, each containing 18 alternating layers of AlInAs barriers and GaInAs quantum wells. List of Experimental Equipment and Materials:
Equipment included a RIBER Compact-21 ТМ MBE facility, photolithography tools, and a Thorlabs PM100D power meter with an S401C photodetecting thermoelectric head. Materials included InGaAs/AlInAs solid solutions and InP substrates.
4：Experimental Procedures and Operational Workflow:
The process involved growing the heterostructure, forming stripes, soldering samples onto heat radiators, and measuring power and dynamic characteristics under pulsed pumping.
5：Data Analysis Methods:
The analysis focused on light–current characteristics and waveforms of photoresponse pulses to assess the heating effects on the active region.
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