研究目的
Investigating the generation of frequency combs by quantum cascade lasers emitting in the 8-μm wavelength range for applications in gas analysis, environment monitoring, nondestructive remote control, and wireless optical communications.
研究成果
The study demonstrated the generation of broadband frequency combs by QCLs in the 8-μm wavelength range, facilitated by a distributed saturable absorber region created through shallow mesa geometry. This approach allows for the generation of frequency combs without complicating the QCL design, opening new possibilities for practical spectroscopy applications.
研究不足
The study is limited to QCLs emitting in the 8-μm wavelength range and does not explore other wavelengths or materials. The mechanism of mode locking in QCLs is not completely understood, indicating areas for further research.
1：Experimental Design and Method Selection:
The study involved the investigation of frequency comb generation by QCLs emitting in the 8-μm wavelength range, focusing on the self-pulsation regime near the lasing threshold and the transition to mode locking with increased pumping current.
2：Sample Selection and Data Sources:
QCLs were manufactured based on a heterostructure with an active region containing 50 quantum cascades, using In
3：53Ga47As quantum dots and Al48In52As barrier layers. List of Experimental Equipment and Materials:
QCL crystals with a mesa formed by wet etching, mounted on a primary heat sink, and studied under pulsed current pumping.
4：Experimental Procedures and Operational Workflow:
The dynamic characteristics of QCLs were studied, including the observation of self-pulsation regimes and the measurement of optical and radio-frequency spectra at various pumping currents.
5：Data Analysis Methods:
Analysis of the optical spectra broadening and the formation of frequency combs, with spectral width measurements and RF spectrum analysis.
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