In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is ...In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is experimentally found to be well maintained during the whole wavelength tuning process.The Laguerre-Gaussian(LG_(0,+1))mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and LG0,-1mode with a range of 76 nm from 1920.4 to 1996.6 nm,are,respectively,obtained.This is,to the best of our knowledge,the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2μm spectral range,as well as the broadest tuning range ever reported from the vortex laser cavity.Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.展开更多
以尼龙6(PA6)为基体材料,以多聚磷酸蜜胺(MPP)/双磷酸哌嗪为复合阻燃剂制备无卤阻燃PA6复合材料。采用扫描电镜观察了无卤阻燃PA6复合材料燃烧物表面的炭层形貌,分析了阻燃剂在PA6中的阻燃机理,研究了MPP用量对无卤阻燃PA6复合材料阻燃...以尼龙6(PA6)为基体材料,以多聚磷酸蜜胺(MPP)/双磷酸哌嗪为复合阻燃剂制备无卤阻燃PA6复合材料。采用扫描电镜观察了无卤阻燃PA6复合材料燃烧物表面的炭层形貌,分析了阻燃剂在PA6中的阻燃机理,研究了MPP用量对无卤阻燃PA6复合材料阻燃性能和流变行为的影响。结果表明:MPP质量分数为10%时,无卤阻燃PA6复合材料的极限氧指数达到33.8%,燃烧热为24.96 k J/g,燃烧后残留物质量保留率为18%。流变研究表明,随着MPP用量增大,无卤阻燃PA6复合材料的表观黏度降低。随着MPP用量增大,促进了燃烧炭层生成,产生了良好的阻燃协同作用。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52032009 and 62075090)Natural Science Foundation of Jiangsu Province(Nos.SBK2019030177 and SBX2021020083)Postgraduates Innovation Program of Jiangsu Province(No.KYCX21_2619)。
文摘In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is experimentally found to be well maintained during the whole wavelength tuning process.The Laguerre-Gaussian(LG_(0,+1))mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and LG0,-1mode with a range of 76 nm from 1920.4 to 1996.6 nm,are,respectively,obtained.This is,to the best of our knowledge,the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2μm spectral range,as well as the broadest tuning range ever reported from the vortex laser cavity.Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.
文摘以尼龙6(PA6)为基体材料,以多聚磷酸蜜胺(MPP)/双磷酸哌嗪为复合阻燃剂制备无卤阻燃PA6复合材料。采用扫描电镜观察了无卤阻燃PA6复合材料燃烧物表面的炭层形貌,分析了阻燃剂在PA6中的阻燃机理,研究了MPP用量对无卤阻燃PA6复合材料阻燃性能和流变行为的影响。结果表明:MPP质量分数为10%时,无卤阻燃PA6复合材料的极限氧指数达到33.8%,燃烧热为24.96 k J/g,燃烧后残留物质量保留率为18%。流变研究表明,随着MPP用量增大,无卤阻燃PA6复合材料的表观黏度降低。随着MPP用量增大,促进了燃烧炭层生成,产生了良好的阻燃协同作用。
