研究目的
Design and fabrication of distributed feedback quantum cascade lasers for very high temperature continuous-wave operation and low electrical power consumption.
研究成果
The study successfully designed and fabricated a low power consumption and high operating temperature DFB QCL at ?? ～ 7.2 μm, achieving a single-mode cw output power of greater than 30 mW at 90°C. This represents an improvement over previously published results for mid-IR DFB QCLs.
研究不足
The study was limited by the measurement setup, preventing tests at the maximum operating temperature. Additionally, the devices were not tested in humid environments, which could affect performance.
1：Experimental Design and Method Selection:
The design focused on achieving low mode loss and high coupling coefficient for the buried grating. The QCL structure was grown on an n-doped InP substrate wafer by solid-source molecular beam epitaxy.
2：Sample Selection and Data Sources:
The active core contained 50 periods of strain-compensated In
3：6Ga4As/In44Al56As quantum wells and barriers. List of Experimental Equipment and Materials:
Equipment included a holographic lithography setup for grating definition, wet chemical etching for transferring the grating, and metal organic chemical vapor deposition for epitaxy. Materials included InP, InGaAs, and InAlAs layers.
4：Experimental Procedures and Operational Workflow:
The process involved grating definition, ridge waveguide formation, upper waveguide epitaxy, insulation deposition, contact formation, and HR coating.
5：Data Analysis Methods:
Optical power and spectra were measured with a thermopile detector and FTIR spectrometer, respectively.
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