研究目的
Investigating the broadband emission and frequency comb RF injection locking in THz quantum cascade lasers.
研究成果
The study demonstrates the potential of homogeneous THz QCLs for broadband emission and frequency comb applications, with observed bandwidths up to 1.83 THz and successful injection locking at low RF powers. The findings suggest that the active region design can serve as a building block towards broadband, on-chip, octave-spanning THz QCL combs.
研究不足
The study is limited by the technical constraints of the experimental setup, including the bandwidth of the detector and the RF matching of the cryo head. The application of the findings is constrained by the need for further optimization of the QCL design for broader bandwidth and lower phase noise.
1：Experimental Design and Method Selection:
The study involves the design and optimization of homogeneous quantum cascade lasers (QCLs) for broadband emission around 3 THz. The methodology includes the use of non-equilibrium Green’s function (NEGF) simulations to model the laser under operation and time-resolved spectrum measurements to observe spectral pulsation.
2：Sample Selection and Data Sources:
The samples are QCL devices fabricated with GaAs/Al0.15Ga0.85As material system, grown by molecular beam epitaxy (MBE). Data sources include light-current-voltage (LIV) curves, emission spectra, and beatnote maps recorded with a spectrum analyzer.
3：15Ga85As material system, grown by molecular beam epitaxy (MBE). Data sources include light-current-voltage (LIV) curves, emission spectra, and beatnote maps recorded with a spectrum analyzer. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a Fourier transform infrared spectrometer (FTIR), CW current/voltage source, bias-tee, spectrum analyzer, oscilloscope, and superconducting Hot-Electron Bolometer (HEB) detector. Materials include GaAs/Al0.15Ga0.85As for the QCL structure.
4：15Ga85As for the QCL structure. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The QCL devices are characterized under pulsed and CW operation, with measurements of LIV curves, emission spectra, and beatnote maps. Injection locking experiments are performed to investigate the coherence properties.
5：Data Analysis Methods:
Data analysis involves the use of NEGF simulations to compare with experimental results, and the analysis of beatnote maps and spectra to assess comb operation and injection locking characteristics.
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Fourier transform infrared spectrometer
Vertex 80v
Bruker
Used for recording emission spectra of the QCL devices.
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CW current/voltage source
Keithley 2000
Keithley
Used to power the QCL devices in CW operation.
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Bias-tee
SHF BT 45D
SHF
Used to connect the QCL to the spectrum analyzer and the current/voltage source.
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Spectrum analyzer
FSW 64
Rohde&Schwarz
Used to analyze the RF signal from the QCL.
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Oscilloscope
HDO6104
LeCroy
Used to observe the instantaneous voltage over the QCL.
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Superconducting Hot-Electron Bolometer
Scontel
Used as a fast detector for time-resolved spectrum measurements.
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