研究目的
To establish the characteristics of two-photon-excited luminescence (TPL) in a polycrystalline aromatic medium and estimate the relative intensity of TPL and spontaneous Raman scattering (RS) spectra.
研究成果
The TPL spectra of POPOP powder, excited by YLF:Nd3+ and copper vapor lasers, were recorded, showing a nonlinear dependence of TPL intensity on the intensity of exciting radiation. The TPL intensity was found to be comparable to that of spontaneous RS under certain excitation conditions, indicating the potential for TPL in applications requiring high sensitivity to electronic and vibrational subsystems of substances.
研究不足
The study is limited by the specific conditions of laser excitation and the characteristics of the POPOP sample used. Potential areas for optimization include the exploration of different excitation wavelengths and the use of samples with varying thicknesses or compositions.
1：Experimental Design and Method Selection:
The study involved exciting TPL in POPOP using two types of lasers and comparing the TPL spectra with spontaneous RS spectra.
2：Sample Selection and Data Sources:
A polycrystalline POPOP powder was used as the sample.
3：List of Experimental Equipment and Materials:
The setup included a solid-state neodymium-doped yttrium lithium fluoride (YLF:Nd3+) laser, a copper vapor laser (CVL), optical filters, lenses, a cuvette with POPOP powder, a notch filter, an optical fiber, an FSD-8 minispectrometer, and a computer.
4：Experimental Procedures and Operational Workflow:
TPL spectra were recorded in the 'reflection' mode, with the secondary radiation focused into a quartz fiber and analyzed by the spectrometer.
5：Data Analysis Methods:
The intensity of TPL was analyzed for its dependence on the intensity of exciting radiation, and the relative intensities of TPL and RS were compared.
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