研究目的
Investigating the spectral redistribution of the intensity of short- and long-wavelength emission components within the gain bandwidth of a quantum-cascade laser under the action of control voltage.
研究成果
The study demonstrated spectral redistribution of the intensity of short- and long-wavelength lasing components within the gain bandwidth under the action of control voltage in a QCL. The voltage-controlled spectral shift at 80 K amounted to approximately 200 nm, and the maximum bandwidth of laser gain was about 300 nm. The use of an external cavity with tunable resonance filter was suggested for high-precision control of the emission wavelength in QCLs of this type.
研究不足
The range of intensity redistribution in the lasing spectrum under the action of control voltage decreases with increasing QCL temperature, and no voltage-dependent spectral shift was observed at 300 K.
1：Experimental Design and Method Selection:
The study involved the demonstration of spectral redistribution of emission components in a quantum-cascade laser (QCL) under varying control voltages. The QCL heterostructure was grown by molecular beam epitaxy (MBE) on a Riber 49 system.
2：Sample Selection and Data Sources:
The laser structures were grown on (001)-oriented InP wafers doped with sulfur. The active region comprised 50 cascades based on In
3：53Ga47As/Al48In52As heteropair. List of Experimental Equipment and Materials:
Equipment included a liquid-nitrogen-cooled HgCdTe photodetector, a BoxCar SR250 integrator, and a Bruker Vertex 80v Fourier spectrometer.
4：Experimental Procedures and Operational Workflow:
The QCL mesa was formed with wet etching into a substrate. The optical signal was detected using a photodetector, and the emission spectra were measured with a Fourier spectrometer.
5：Data Analysis Methods:
The emission spectra were analyzed to observe the shift in wavelength under varying control voltages.
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