研究目的
To study the optical properties of a multimode silica optical fiber with a reflective shell from a fluorinated thermoplastic polymer, specifically focusing on its optical losses, numerical aperture, and the scattering behavior of light by the reflective shell, and to consider its potential applications in laser medicine.
研究成果
The study successfully fabricated and characterized silica–polymer optical fibers with a Tefzel coating, demonstrating their potential for use in laser medicine despite the presence of additional optical losses due to light scattering by the reflective shell. The findings highlight the importance of material properties in the design of optical fibers for specific applications.
研究不足
The study notes that the optical losses in the material of the polymer shell are substantially higher than in the silica glass of the core, which could limit the efficiency of the optical fibers. Additionally, the scattering of light by the reflective shell, while providing insights into the material's properties, may also introduce unwanted losses in practical applications.
1：Experimental Design and Method Selection:
The study involved the fabrication of silica–polymer optical fibers with a Tefzel coating using the die method. The optical properties, including optical losses and numerical aperture, were measured. The scattering of light by the reflective shell was also investigated.
2：Sample Selection and Data Sources:
Samples of optical fibers with a core diameter of 430 μm and a 70-μm-thick Tefzel coating were fabricated from a KUVI silica rod.
3：List of Experimental Equipment and Materials:
Equipment included a KGM-9-70 incandescent lamp, MDR-3 monochromator, FEU-51 photodetector, V7-22A digital voltmeter, and a He–Ne laser. Materials included the KUVI silica rod and Tefzel thermoplastic polymer.
4：Experimental Procedures and Operational Workflow:
Optical losses were measured by the break method. The numerical aperture was estimated from measurements of angular distribution of radiation intensity in the far-field zone. The intensity of radiation scattered by the Tefzel reflective shell and its indicatrix were measured.
5：Data Analysis Methods:
Optical losses were calculated using the break method formula. The effective numerical aperture was calculated from the angular distribution of radiation intensity. The scattering indicatrix was analyzed to understand the scattering behavior of the reflective shell.
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