研究目的
Investigating the effect of laser irradiation on the optical properties of Se58Ge27Pb15 and Se58Ge24Pb18 thin films.
研究成果
The optical properties of laser-irradiated Se58Ge27Pb15 and Se58Ge24Pb18 thin films were studied. Structural characterisation revealed an increase in crystallinity on laser irradiation. The band gap was found to decrease for Se58Ge27Pb15 thin films, while an unexpected increase was observed for Se58Ge24Pb18 thin film at a laser irradiation time of 8 min. The changes in optical properties make these thin films promising materials for optical recording media and nonlinear optical devices.
研究不足
The study is limited to the effects of laser irradiation on the optical properties of Se58Ge27Pb15 and Se58Ge24Pb18 thin films. The study does not explore the effects of different laser wavelengths or intensities.
1：Experimental Design and Method Selection:
The amorphous samples of Se58Ge27Pb15 and Se58Ge24Pb18 glasses were prepared using the melt quenching method. Thin films were deposited using the vacuum evaporation technique. These films were then illuminated with Nd: YAG 532 nm green laser radiation.
2：Sample Selection and Data Sources:
The samples were structurally characterised using X-ray Diffraction (XRD) and Energy-dispersive X-ray analysis. Optical properties were tested through absorption, reflection, and transmission spectra recorded on a UV-vis spectrophotometer.
3：List of Experimental Equipment and Materials:
Nd: YAG laser (energy: 2 mJ; pulse duration: 5 ns) at 532 nm wavelength, Panalytical X’pert Pro diffractometer, Quanta Fe200 model for EDAX, Agilent Cary 60 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The films were irradiated with laser for different durations. XRD and EDAX were used for structural characterisation, and UV-vis spectrophotometer for optical properties.
5：Data Analysis Methods:
The optical band gap, refractive index, extinction coefficient, and Urbach energy were calculated using the Swanepoel method and Tauc relation.
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