研究目的
Investigating the current-induced polarization change and transverse mode change in mid-infrared quantum cascade lasers.
研究成果
The study demonstrated that the optical polarization of quantum cascade lasers can change with the laser's working conditions. A strong negative correlation was found between TE-polarized light contribution and the fundamental mode contribution, suggesting a relationship between the polarization of the beams and the presence of higher-order modes in their transverse mode structure.
研究不足
The study was limited to a small number of measuring points, which may affect the robustness of the statistical analysis. Additionally, the correlation analysis was limited to linear regression, potentially overlooking non-linear relationships.
1：Experimental Design and Method Selection:
The study involved measuring far-field distributions of polarization projection on the linear polarization basis to determine the polarization of laser beams emitted by quantum cascade lasers.
2：Sample Selection and Data Sources:
Quantum cascade lasers with an active region containing In
3：0377GaAs/Al45GaAs coupled quantum wells were studied. List of Experimental Equipment and Materials:
A goniometric profiler with a linear polarizer was used for measurements.
4：Experimental Procedures and Operational Workflow:
Far-field power distributions were measured for each current with the polarizer in two perpendicular positions. Measurements were performed at room temperature with lasers supplied with 100-ns pulses at 500 Hz.
5：Data Analysis Methods:
The contributions of each polarization were calculated as the ratio of the total power value measured for the particular position of the polarizer to the sum of the total power values measured for both positions of the polarizer. Reverse beam analysis was used to achieve intensities of transversal modes in the near field.
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