研究目的
To propose a new approach to passive electromagnetic modelling of coupled–cavity quantum cascade lasers and to elaborate basic synthesis rules of such lasers.
研究成果
The proposed method allows for unequivocal determination of resonant frequencies and the corresponding spectrum of a threshold gain in coupled-cavity quantum cascade lasers. It significantly speeds up the electromagnetic analysis by splitting the problem into deterministic, low-quality-factor sections. The study also establishes basic synthesis rules for designing such lasers, demonstrating the method's utility in practical applications.
研究不足
The method's applicability is primarily demonstrated on QCLs operating in the infrared spectrum, and its effectiveness in other spectral ranges or with different laser configurations may require further validation. The computational efficiency, while improved, may still be a constraint for very complex or large structures.
1：Experimental Design and Method Selection:
The study employs a novel approach to consider a coupled-cavity Fabry-Perot resonant structure with partially transparent mirrors as a two-port network, allowing for deterministic problem analysis. This method splits the passive analysis of an electrically long laser into a cascade of relatively short sections with low quality factor, speeding up the electromagnetic analysis.
2：Sample Selection and Data Sources:
The analysis focuses on quantum cascade lasers (QCLs) operating in the infrared spectrum, with specific geometries and materials as detailed in the paper.
3：List of Experimental Equipment and Materials:
The study utilizes numerical methods such as finite-difference time-domain (FDTD) for rigorous electromagnetic modelling and the transfer-matrix method for calculating reflection coefficients.
4：Experimental Procedures and Operational Workflow:
The methodology involves splitting the resonant cavity into non-resonating sections to calculate reflection coefficients, and using the scattering matrix [S] to represent the laser as a two-port network. The analysis includes determining resonant frequencies and the spectrum of a threshold gain.
5：Data Analysis Methods:
The study uses the Nicolson–Ross–Weir algorithm to extract complex refractive index of effective medium from [S] parameters, and analyzes the impact of geometry on spectral properties of the laser.
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