通过引入特征温度与硫系玻璃相匹配的高性能热塑性聚合物聚酰亚胺（PEI）作为光纤包层,结合复丝工艺制备了像素数为900的As2S3/PEI光纤传像束,表征了光纤的损耗、光纤束的断丝率、分辨率和串扰率。As2S3/PEI光纤在2~6μm波段传输性能优...通过引入特征温度与硫系玻璃相匹配的高性能热塑性聚合物聚酰亚胺（PEI）作为光纤包层,结合复丝工艺制备了像素数为900的As2S3/PEI光纤传像束,表征了光纤的损耗、光纤束的断丝率、分辨率和串扰率。As2S3/PEI光纤在2~6μm波段传输性能优异,背景损耗约为0.5 d B/m,在S-H杂质对应的4.0μm波长的峰值损耗为3.5 d B/m。单丝直径为80μm、像素数为900的光纤束的断丝率为1%,分辨率为7 line/mm,串扰率为1%,通过此传像束得到了清晰的电烙铁红外图像。而且,将PEI溶于二甲基乙酰胺（DMAC）后使光纤束表现出很好的柔性。采用这种类似＂酸溶玻璃＂的可溶于特定溶剂的热塑性聚合物,作为过渡介质,结合复丝工艺有望制备出柔性高分辨率硫系玻璃光纤传像束。展开更多
通过动态蒸馏提纯技术制备了高纯Ge-As-Se和Ge-As-S硫系玻璃。采用两步棒管法拉制了以Ge-As-Se玻璃为纤芯、Ge-As-S玻璃为包层的小芯径阶跃折射率光纤,并使用飞秒激光抽运光纤测试了超连续谱的产生。以Al和GaCl_3分别作为除氧剂和C/H纯...通过动态蒸馏提纯技术制备了高纯Ge-As-Se和Ge-As-S硫系玻璃。采用两步棒管法拉制了以Ge-As-Se玻璃为纤芯、Ge-As-S玻璃为包层的小芯径阶跃折射率光纤,并使用飞秒激光抽运光纤测试了超连续谱的产生。以Al和GaCl_3分别作为除氧剂和C/H纯化剂可以有效消除玻璃中的C、H和O杂质。制备的Ge As Se/Ge As S光纤在2~9μm波段表现出优异的传输性能,光纤数值孔径约为1.3;采用重复频率为10.5 MHz、脉冲宽度为320 fs、中心波长为4.0μm、峰值功率为4.6 k W激光抽运长度为22 cm、芯径为6μm的光纤,获得了覆盖1.9~8.2μm、光谱平坦度为±10 d B、平均功率为4.5 m W的超连续谱。展开更多
Cubic YAG：Yb3＋, Ho3＋ pure phase nanocrystals were synthesized by using coprecipition nitrate and ammonium hydrogen carbonate as raw materials.After calcining the precipitates at 800 °C, the resultant YAG：Yb3...Cubic YAG：Yb3＋, Ho3＋ pure phase nanocrystals were synthesized by using coprecipition nitrate and ammonium hydrogen carbonate as raw materials.After calcining the precipitates at 800 °C, the resultant YAG：Yb3＋, Ho3＋ nanocrystals were nearly spheric and the particle size was about 40 nm.Intense upconversion spectra were observed on the powder compact pumped by a 980 nm continuous wave diode laser, and green emission centered at 549 nm, red emission centered at 667 nm, and NIR centered at 760 nm were all due to two photons process, which originated from 5S2（5F4）→5I8, 5F5→5I8, and 5S2（5F4）→5I7 transitions, respectively.展开更多
We experimentally demonstrate the generation of sub-100-fs pulses from a diode-pumped passively mode-locked Yb：Y3ScAl4O12 （Yb：YSAG） ceramic laser. Stable mode-locked pulses as short as 96 fs at the central wavelen...We experimentally demonstrate the generation of sub-100-fs pulses from a diode-pumped passively mode-locked Yb：Y3ScAl4O12 （Yb：YSAG） ceramic laser. Stable mode-locked pulses as short as 96 fs at the central wavelength of 1052 nm with a repetition rate of -102 MHz are obtained. The laser has a maximum average output power of 51 mW. To the best of our knowledge, these are so far the shortest pulses and the first demonstration of sub-100- fs pulses obtained from the mode-locked Yb：YSAG ceramic lasers.展开更多
We demonstrate a narrow linewidth 1881 nm Tm：YAG ceramic laser that combines the advantages of in-band pumping at 1617 nm and volume Bragg grating as a wavelength selection device. With an output coupler of 5% transm...We demonstrate a narrow linewidth 1881 nm Tm：YAG ceramic laser that combines the advantages of in-band pumping at 1617 nm and volume Bragg grating as a wavelength selection device. With an output coupler of 5% transmission, a maximum output power of 200 mW is obtained at 1881 nm with a linewidth of 0.2 nm.展开更多
We report a compact Ho：LuAG ceramic laser intracavity pumped by a diode-pumped Tm：YAG ceramic laser. The laser oscillation is accomplished by using a common linear cavity configuration containing Tm：YAG and Ho：LuA...We report a compact Ho：LuAG ceramic laser intracavity pumped by a diode-pumped Tm：YAG ceramic laser. The laser oscillation is accomplished by using a common linear cavity configuration containing Tm：YAG and Ho：LuAG ceramics. The 1.0 at.% Ho：LuAG ceramic laser yields 1.15 W of maximum output simultaneously at 2094 and 2100 nm with a beam quality factor of M2-2.8.展开更多
文摘通过引入特征温度与硫系玻璃相匹配的高性能热塑性聚合物聚酰亚胺（PEI）作为光纤包层,结合复丝工艺制备了像素数为900的As2S3/PEI光纤传像束,表征了光纤的损耗、光纤束的断丝率、分辨率和串扰率。As2S3/PEI光纤在2~6μm波段传输性能优异,背景损耗约为0.5 d B/m,在S-H杂质对应的4.0μm波长的峰值损耗为3.5 d B/m。单丝直径为80μm、像素数为900的光纤束的断丝率为1%,分辨率为7 line/mm,串扰率为1%,通过此传像束得到了清晰的电烙铁红外图像。而且,将PEI溶于二甲基乙酰胺（DMAC）后使光纤束表现出很好的柔性。采用这种类似＂酸溶玻璃＂的可溶于特定溶剂的热塑性聚合物,作为过渡介质,结合复丝工艺有望制备出柔性高分辨率硫系玻璃光纤传像束。
文摘通过动态蒸馏提纯技术制备了高纯Ge-As-Se和Ge-As-S硫系玻璃。采用两步棒管法拉制了以Ge-As-Se玻璃为纤芯、Ge-As-S玻璃为包层的小芯径阶跃折射率光纤,并使用飞秒激光抽运光纤测试了超连续谱的产生。以Al和GaCl_3分别作为除氧剂和C/H纯化剂可以有效消除玻璃中的C、H和O杂质。制备的Ge As Se/Ge As S光纤在2~9μm波段表现出优异的传输性能,光纤数值孔径约为1.3;采用重复频率为10.5 MHz、脉冲宽度为320 fs、中心波长为4.0μm、峰值功率为4.6 k W激光抽运长度为22 cm、芯径为6μm的光纤,获得了覆盖1.9~8.2μm、光谱平坦度为±10 d B、平均功率为4.5 m W的超连续谱。
基金supported by the National Natural Science Foundation of China (50372075)Shanghai Light-Tech Project (036105021)Singapore AStar SERC (052 101 0039)
文摘Cubic YAG：Yb3＋, Ho3＋ pure phase nanocrystals were synthesized by using coprecipition nitrate and ammonium hydrogen carbonate as raw materials.After calcining the precipitates at 800 °C, the resultant YAG：Yb3＋, Ho3＋ nanocrystals were nearly spheric and the particle size was about 40 nm.Intense upconversion spectra were observed on the powder compact pumped by a 980 nm continuous wave diode laser, and green emission centered at 549 nm, red emission centered at 667 nm, and NIR centered at 760 nm were all due to two photons process, which originated from 5S2（5F4）→5I8, 5F5→5I8, and 5S2（5F4）→5I7 transitions, respectively.
基金partially supported by the National Natural Science Foundation of China(No.61575089)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe fund of the Ministry of Education(MOE),Singapore(Grant No.2016-T1-001-026)
文摘We experimentally demonstrate the generation of sub-100-fs pulses from a diode-pumped passively mode-locked Yb：Y3ScAl4O12 （Yb：YSAG） ceramic laser. Stable mode-locked pulses as short as 96 fs at the central wavelength of 1052 nm with a repetition rate of -102 MHz are obtained. The laser has a maximum average output power of 51 mW. To the best of our knowledge, these are so far the shortest pulses and the first demonstration of sub-100- fs pulses obtained from the mode-locked Yb：YSAG ceramic lasers.
基金This work was supported by the National Natural Science Foundation of China （Nos. 61177045 and 61308047）, the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Postgraduates Innovation Program of Jiangsu Province （No. CXZZ12_0978）.
文摘We demonstrate a narrow linewidth 1881 nm Tm：YAG ceramic laser that combines the advantages of in-band pumping at 1617 nm and volume Bragg grating as a wavelength selection device. With an output coupler of 5% transmission, a maximum output power of 200 mW is obtained at 1881 nm with a linewidth of 0.2 nm.
基金supported by the National Natural Science Foundation of China(Nos.61177045 and 11274144)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘We report a compact Ho：LuAG ceramic laser intracavity pumped by a diode-pumped Tm：YAG ceramic laser. The laser oscillation is accomplished by using a common linear cavity configuration containing Tm：YAG and Ho：LuAG ceramics. The 1.0 at.% Ho：LuAG ceramic laser yields 1.15 W of maximum output simultaneously at 2094 and 2100 nm with a beam quality factor of M2-2.8.
