新型高增益氟硫改性磷酸盐光纤及L波段光纤激光  

New high-gain fluoro-sulfo-phosphate fiber and L-band fiber laser

作　　者：朱金钟 姬瑶 黎仲贤 耿鑫 张勤远 ZHU JinZhong;JI Yao;LI ZhongXian;GENG Xin;ZHANG Qin Yuan(School of Physics and Optoelectronics,State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学物理与光电学院,发光材料与器件国家重点实验室,广东省光纤激光材料与应用技术重点实验室,广州510640

出　　处：《中国科学：技术科学》2024年第4期655-664,共10页Scientia Sinica(Technologica)

基　　金：国家自然科学基金重点项目(批准号:52130201)资助。

摘　　要：L波段(1565~1625 nm)激光是光通信信道容量拓展、测风雷达、生物气溶胶检测等领域发展的迫切与重大需求.稀土离子掺杂的高增益有源光纤是L波段光纤激光器的核心增益介质和关键科学难题.然而,目前石英有源光纤存在稀土离子溶解度低、发光效率低、增益系数低等问题,严重制约着光纤激光器的性能提升.因此,探索在L波段具有优异放大能力的新型高增益介质是该领域的主要挑战之一.本文报道了一种新型Er^(3+)/Yb^(3+)共掺氟硫改性磷酸盐(FSP)激光玻璃光纤及其L波段光纤激光输出.结果表明,FSP玻璃光纤为稀土离子提供了丰富的配位环境,具有高增益与宽带宽的特性.Er^(3+)/Yb^(3+)共掺FSP玻璃光纤品质因子为5.7×10^(-23)s cm^(2),增益带宽为49.7×10^(-27)cm^(3),峰值净增益系数达5.3 dB cm^(-1)@1540 nm,在1600 nm波段的增益系数可达2.4 dB cm^(-1).基于超短长度(1 cm) FSP光纤即可实现中心波长为1617 nm的L波段激光输出.此外,FSP玻璃光纤还具有弹性模量高(>80 GPa)、抗析晶稳定性好(>200℃)和化学稳定性强(溶解速率<0.2×10^(-7)g cm^(-2)min^(-1))等优势.研究表明,新型高增益FSP光纤具有优异的长波放大性能,为L波段超短线性腔光纤激光器所需的增益材料提供了解决方案.L-band(1525-1625 nm)lasers are of immense importance for channel capacity expansion,wind speed radar,and bioaerosol detection.The active fiber plays a crucial role in the performance of L-band fiber devices as the gain medium.However,the low rareearth solubility,low luminescent efficiency,and low gain coefficient of silica fibers limit the laser performance.Obtaining an appropriate gain medium withexcellent amplification capabilty in the L-bandisa major challenge.Anewly developed ErYb co doped fluoro-sulfo-phosphate(FSP)laser glass fiber and an L-band(@1617 nm)fiber laser are reported herein.FSP glass fiber provides various ligands for the rare-earth ions and exhibits a high gain and a wide bandwidth.Furthermore,Er^(3+)/Yb^(3+)co-doped FSP glass fiber has a high figure-of-merit(5.7×10^(-23)s cm^(2)),broad gain bandwidth(49.7×10^(-27)cm^(3)),and high net gain coefficients of 5.3 dB cm-@1540 nm and 2.4 dB cm^(-1)@1600 nm.The L-band laser output(@1617 nm)can be achieved using FSP fiber with an ultrashort length of 1 cm.Moreover,FSP fiber exhibits high elastic modulus(>80 GPa),high anticrystallization ability(>200℃),and high chemical durability(dissolution rate<0.2×10^(-7)g cm^(-2)min^(-1)).The results indicate that the new FSP fiber has excellent longwavelength amplification capability,which could provide solutions for the gain medium required by L-band ultrashort linear cavity fiberlasers.

关 键 词：激光玻璃 磷酸盐光纤 氟硫改性磷酸盐光纤 光纤激光器 

分 类 号：TN248[电子电信—物理电子学]