研究目的
To develop a thermal modification method to improve the photoelectric properties of g-C3N4 and use it as a saturable absorber in a passively Q-switched Nd:LLF laser at 1.06 μm to enhance laser performance.
研究成果
Thermal oxidation etching effectively reduces the band gap and creates porous structures in g-C3N4, enhancing its performance as a saturable absorber. The modified g-C3N4 enabled a passively Q-switched Nd:LLF laser with a pulse width of 110 ns and repetition rate of 95.5 kHz, achieving the shortest pulse width and highest pulse peak power reported for g-C3N4-based SAs at 1 μm, demonstrating the method's efficacy for improving laser applications.
研究不足
The study is limited to specific thermal modification conditions and laser parameters; optimization for other wavelengths or materials was not explored. Potential thermal losses and astigmatism in the resonator may affect performance, and scalability or commercial applicability were not addressed.
1：Experimental Design and Method Selection:
The study involved synthesizing and thermally modifying g-C3N4 samples, characterizing their properties using XRD, SEM, and spectrophotometry, and testing them as saturable absorbers in a passively Q-switched laser setup. A V-type resonator was used for laser experiments to minimize astigmatism and improve beam quality.
2：Sample Selection and Data Sources:
g-C3N4 samples (CN-0, CN-4, CN-5, CN-6) were prepared from melamine with controlled calcination times. Data were obtained from laboratory measurements of optical and nonlinear properties.
3：List of Experimental Equipment and Materials:
Equipment included a muffle furnace for synthesis, XRD diffractometer (Bruker D8 Advance), SEM, UV-vis-NIR spectrophotometer (U-4100, Hitachi), laser diode pump (FAP system, Coherent), power meter (MAX 500 CE, Coherent), optical spectrum analyzer (MS3504i, SOL Instruments), digital oscilloscope (DPO7104C, Tektronix), and materials like melamine, deionized water, HCl, alumina crucibles, agate mortar, YAG substrates.
4：Experimental Procedures and Operational Workflow:
g-C3N4 was synthesized by heating melamine, then thermally modified at 550°C for different durations. Samples were characterized for structure and optical properties. For laser experiments, samples were deposited on YAG substrates and inserted into a V-type resonator with a Nd:LLF crystal. Output power, pulse characteristics, and spectra were measured under varying pump powers.
5：Data Analysis Methods:
Nonlinear transmission data were fitted using a saturable absorption model equation. Beam quality factors were determined using the knife-edge method. Statistical analysis of pulse stability was performed, and results were compared with literature.
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