研究目的
Investigating the resonance-induced processes during harmonic generation in laser-produced plasmas using picosecond pulses and analyzing the efficiency of high-order harmonic generation (HHG) in different plasma media.
研究成果
The study demonstrates the potential of using picosecond pulses for efficient harmonic generation in laser-produced plasmas, with particular emphasis on resonance enhancement of single harmonics. The findings suggest that carbon-containing plasmas and nanoparticle-containing plasmas are promising media for high-order harmonic generation, with applications in spectroscopy and nonlinear optics.
研究不足
The study is limited by the technical challenges of creating long cells with homogeneous distribution of alkali metal vapor and the difficulty in achieving phase matching in highly ionized plasmas. The efficiency of harmonic generation is also limited by the intensity and duration of the laser pulses.
1：Experimental Design and Method Selection:
The study involves the use of picosecond and femtosecond laser pulses for harmonic generation in various plasma media, including carbon-containing plasmas and nanoparticle-containing plasmas. The methodology includes the analysis of resonance conditions and phase matching for efficient harmonic generation.
2：Sample Selection and Data Sources:
The samples include carbon-containing materials (graphite, fullerenes, carbon nanotubes), metal plasmas (Pb, Sn, Mn), and nanoparticle-containing plasmas (In2O3, Sn, Mn2O3). Data is collected through spectral measurements and harmonic generation efficiency.
3：3). Data is collected through spectral measurements and harmonic generation efficiency.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a passive-mode-locked Nd:YAG laser, Ti:sapphire laser, vacuum monochromator, photomultiplier tube (PMT), and various targets (graphite, glassy carbon, pyrographite, boron carbide, silicon carbide, pencil lead).
4：Experimental Procedures and Operational Workflow:
The procedure involves laser ablation of targets to produce plasma plumes, followed by harmonic generation using probe pulses. The delay between pump and probe pulses, distance from the target, and laser intensity are varied to optimize harmonic generation.
5：Data Analysis Methods:
Harmonic spectra are analyzed using a vacuum monochromator and PMT. Conversion efficiency is measured by calibrating the detection system at known wavelengths.
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