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In this paper,we demonstrate an all-fiber linearly polarized fiber laser oscillator.The single polarization of the oscillator is achieved through the careful designing of the active fiber coiling.The relationship between fiber coiling diameter and polarization extinction ratio and optical efficiency is studied,whose results lead to an optimized system.The thermal management of the oscillator is also refined,which allows the oscillator to reach a maximum output power of44.1 W with an optical-to-optical efficiency of 57.9%.A high average polarization extinction ratio of 21.6 d B is achieved during a 2-hour stability test.The oscillator also owns a narrow 3-d B bandwidth of 0.1 nm,as well as near-diffraction-limit beam quality of M~2~ 1.14. 相似文献
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采用共沉淀法制备得到了线性麦芽糊精聚合物功能化的Fe3O4磁性纳米粒子(LM-SP-MNPs),通过傅里叶变换红外光谱、透射电子显微镜、热重分析等技术对其结构、形貌进行了表征。 其粒径大小为(12±2) nm。 选取抗癌药物盐酸阿霉素(DOX)作为模型药物,运用荧光光谱法研究了LM-SP-MNPs的载药性能和释放行为,探讨了pH值对LM-SP-MNPs药物释放性能的影响。 最适pH条件下,LM-SP-MNPs对盐酸阿霉素的最大吸附量约为357.1 mg/g,吸附等温线符合Freundlich等温吸附模型。 LM-SP-MNPs与盐酸阿霉素的复合物(DOX@LM-SP-MNPs),在37 ℃的条件下药物在酸性条件下的释放效率大于中性条件。 pH=5.3时,盐酸阿霉素在7 h内的累积释放率为26.9%。 此外,细胞毒性试验表明,LM-SP-MNPs具有良好的生物相容性,而DOX@LM-SP-MNPs和肝癌细胞共培养后可以明显杀死HepG2肝癌细胞。 相似文献
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坡矩阵的Cline逆 总被引:1,自引:0,他引:1
研究了坡矩阵的广义逆. 首先引入坡矩阵的Cline逆和Drazin逆, 运用坡矩阵的性质证明任意坡矩阵都有Drazin逆, 从而得出任意坡矩阵都有Cline逆,并且是唯一的. 进一步,如果A 存在,那么AC等于A . 最后,给出AC的一些性质. 相似文献
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首先将软集的参数集赋予亚BCI-代数, 给出了亚BCI-代数的$(\alpha,\beta)$-软理想的概念.当$U=[0,1], \alpha=U, \beta=\phi$时,相应地就得到了亚BCI-代数的犹豫模糊理想的概念.研究了亚BCI-代数的$(\alpha,\beta)$-软理想的一些重要性质.最后讨论了亚BCI-代数的$(\alpha,\beta)$-软理想的同态像和原像的性质. 相似文献
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This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the power transfer between the core modes and the cladding modes during thermally-induced refractive index variations is established based on the mode coupling theory. The results of numerical simulations based on actual laser parameters are presented. Experimental measurements were also carried out, the results showed good agreement with the corresponding simulation results. 相似文献
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We study internal features of fiber fuse in a Yb-doped double-clad fiber. The samples of fiber fuse are acquired at the power level of 3 kW in an all-fiber forward-pumped master oscillator power amplifier configuration fiber laser that is built specially for fiber fuse analyses. At this high power level, drastic refractive-index redistribution arises in an expended high refractive index area around the bullet-shaped voids of fiber fuse. Electron spin resonance analyses on post-fiber-fuse samples of the Yb-doped double-clad fiber indicate rising Frenkel defect concentration, meanwhile showing a new resonance center that is different from the ones of the Ge-doped fibers studied previously. This new resonance center probably suggests the generation of Al-oxygen hole center, a kind of defect formed during the catastrophic fuse process. 相似文献