研究目的
Investigating the ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique.
研究成果
The study successfully demonstrated ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique. The results show high controllability of multiple phonon modes, which could be beneficial for thermal management in future high-power and broadband electronic devices.
研究不足
The study is limited to the control of phonon modes in silicon carbide and may not be directly applicable to other materials without further research.
1：Experimental Design and Method Selection:
The study utilized a pulse-shaping technique combined with sub-10-fs optical pulses and a two-dimensional spatial light modulator (SLM) for controlling multiple coherent phonons in silicon carbide.
2：Sample Selection and Data Sources:
A 4H-SiC single crystal was used as the sample.
3：List of Experimental Equipment and Materials:
The setup included a mode-locked Ti:sapphire laser, a reflective two-dimensional SLM based on liquid crystal on silicon (2D LCOS-SLM), and a β-BaB2O4 (BBO) crystal for evaluating the temporal waveform of shaped optical pulses.
4：Experimental Procedures and Operational Workflow:
The pump and probe beams were focused on the sample non-coaxially using the same off-axis parabolic mirror. The transient transmission changes were measured by precisely tuning the time interval between pulses.
5：Data Analysis Methods:
The FT power spectra obtained from the time domain data were analyzed to evaluate the performance of the coherent control.
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