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提出一种新型的全固态八边形大模场低损耗的掺镱石英光子晶体光纤,利用多极法对光纤的结构和特性进行了模拟.这种结构的光子晶体光纤空气孔由掺有少量氧化硼的石英棒代替,简化了制备过程,提高了光纤的热损伤阈值.在波长为1.064μm处,光纤的模场面积可达2000μm2,还可实现单模传输,而且其弯曲损耗很小,当弯曲半径为5cm时弯曲损耗小于0.5dB/m.这种光纤对光纤激光器和光纤放大器的发展有重要意义.
A novel all-solid octagonal-shaped low-loss, ytterbium-doped quartz photonic crystal fiber with an octagonal shape was proposed and the structure and characteristics of the fiber were simulated by the multi-pole method. The photonic crystal fiber Boron oxide is replaced by quartz rod, which simplifies the preparation process and enhances the thermal damage threshold of optical fiber.When the wavelength is 1.064μm, the mode field area of the optical fiber can reach 2000μm2, single mode transmission can be realized, and the bending loss is small, The bending loss is less than 0.5dB / m when the bending radius is 5cm. This kind of fiber is of great significance to the development of fiber laser and fiber amplifier.