研究目的
Investigating the effect of laser ridge width on comb operation in single plasmon waveguide quantum cascade lasers emitting around 4.2 THz.
研究成果
The numerical and experimental investigations reveal that a ridge width of 150 μm provides the flattest total GVD, making it optimal for frequency comb operation in single plasmon waveguide terahertz quantum cascade lasers. The developed numerical evaluation method can guide the experimental implementation for achieving broadband frequency combs by optimizing the structures for flat GVDs.
研究不足
The study is limited to single plasmon waveguide quantum cascade lasers emitting around 4.2 THz. The findings may not be directly applicable to other types of lasers or different frequency ranges.
1：Experimental Design and Method Selection:
The study involves numerical simulation and experimental verification of the effect of ridge width on the comb operation of terahertz quantum cascade lasers. The total group velocity dispersion (GVD) is evaluated for different ridge widths.
2：Sample Selection and Data Sources:
Three lasers with an identical cavity length of 6 mm and different ridge widths (100, 150, and 200 μm) are studied.
3：List of Experimental Equipment and Materials:
Quantum cascade lasers with specified ridge widths, inter-mode beat note measurement setup, on-chip dual-comb multiheterodyne spectroscopy setup.
4：Experimental Procedures and Operational Workflow:
The GVD contributions from material, gain, and waveguide are analyzed. Inter-mode beat note and on-chip dual-comb measurements are performed to verify the simulation results.
5：Data Analysis Methods:
The GVDs are numerically evaluated and compared with experimental results to determine the optimal ridge width for comb operation.
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