研究目的
To develop a 2-μm-band active distributed Bragg reflector (DBR) laser for CO2 gas sensing with improved power penalty during tuning and to demonstrate its practical application in CO2 gas detection.
研究成果
The developed 2-μm-band ADBR laser demonstrated improved output power penalty during tuning and practical CO2 gas sensing performance. The study provided insights into the relationship between output power and tuning efficiency, offering a perspective for the optimal design of ADBR lasers.
研究不足
The study notes a lower tuning efficiency of the ADBR laser compared to the conventional DBR laser, attributed to carrier consumption in the active tuning section. The absolute error in the carrier density ratio (k) was acknowledged, suggesting areas for further optimization.
1：Experimental Design and Method Selection:
The study involved the design and fabrication of a 2-μm-band active DBR laser with single quantum well (SQW) gain in the tuning sections to compensate for free carrier absorption. Theoretical models and calculations were used to predict the laser's performance.
2：Sample Selection and Data Sources:
The laser was fabricated using strained InGaAs/InGaAs multi-QWs on an n-doped InP substrate. The performance was compared with a conventional DBR laser without active SQW.
3：List of Experimental Equipment and Materials:
The fabrication process involved metal-organic chemical vapor epitaxy (MO-VPE), electron beam lithography, and photolithographic processes. The experimental setup for CO2 gas sensing included an arbitrary waveform generator (AWG), a photo-detector (PD) integrated with a transimpedance amplifier (TIA), and an oscilloscope.
4：Experimental Procedures and Operational Workflow:
The laser's output power and tuning efficiency were measured under various current conditions. CO2 gas detection was demonstrated by tuning the laser across nine CO2 absorption lines.
5：Data Analysis Methods:
The relationship between output power and tuning efficiency was analyzed using a rate equation model that includes carrier consumption for the optical gain of the active SQW.
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