研究目的
Characterizing the relaxation dynamics in a photo-excited self-assembled InAs quantum dot (QD) semiconductor using a dual-comb-based asynchronous optical sampling (ASOPS) pump-probe measurement system.
研究成果
The developed ASOPS pump-probe system successfully characterized the relaxation dynamics of photo-excited InAs QDs with a wide temporal dynamic range and high stability, demonstrating its utility as a powerful tool for studying complex photo-excited dynamics in QD materials.
研究不足
The temporal resolution was limited by the correlation function between the pump and probe pulses (180 fs), affecting the effective temporal dynamic range.
1：Experimental Design and Method Selection:
Utilized two lab-built Er-fiber combs as pump and probe combs with a feedback frequency control system for tight stabilization of frep.
2：Sample Selection and Data Sources:
Prepared a self-assembled InAs QDs sample consisting of 150 layers of InAs QDs grown on an InP (311)B substrate.
3：List of Experimental Equipment and Materials:
Included Er-doped fiber amplifier, InGaAs detector, digitizer, and variable analog delay line.
4：Experimental Procedures and Operational Workflow:
The pump comb was enhanced and focused to excite the sample, while the probe comb was divided into two optical paths for balanced detection.
5：Data Analysis Methods:
The signal was obtained by a digitizer synchronized to the frep of the probe comb, with optimization of the sampling trigger timing.
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