研究目的
Investigating the creation of broadband color centers in PMMA by means of femtosecond laser pulses for potential applications in optical elements and devices.
研究成果
Laser-induced modification of PMMA leads to the appearance of broadband color centers with a high quantum yield up to 38%. This makes modified PMMA a promising material for the development of competitive phosphors and optically active materials for changing emission spectra of semiconducting lasers and light guides.
研究不足
The study does not address the long-term stability of the color centers under various environmental conditions or the scalability of the modification process for industrial applications.
1：Experimental Design and Method Selection:
The study involved the use of femtosecond laser pulses to modify PMMA and create broadband color centers. The second harmonic of a Coherent Mira Optima 900-D femtosecond laser was used for the formation of color centers in PMMA.
2：Sample Selection and Data Sources:
PMMA samples were obtained by the radical polymerization of methyl methacrylate using benzoyl peroxide as an initiator.
3：List of Experimental Equipment and Materials:
The equipment included a Coherent Mira Optima 900-D femtosecond laser, a microlens with a magnification of 40×, a continuous-wave laser with a wavelength of 360 nm, a dual monochromator, a photomultiplier tube, a Horiba Fluorolog-3 spectrometer, and a Lambda 1050 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Laser radiation was focused into the focal region with a diameter of about 2 μm. The luminescence excitation was conducted by means of the same microlens. The luminescence spectra were recorded in the backscattering configuration. The absolute quantum fluorescence yield was measured using the Horiba Fluorolog-3 spectrometer.
5：Data Analysis Methods:
The quantum yield was determined by a specific formula, and the absorption spectrum of the studied samples was measured.
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