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Er3+/Yb3+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.Er3+/Yb3+共掺FSP玻璃光纤品质因子为5.7×10-23 s cm2,增益带宽为49.7×10-27 cm3,峰值净增益系数达5.3 dBcm-1@1540 nm,在1600nm波段的增益系数可达2.4 dB cm-1.基于超短长度(1cm)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(＞80GPa)、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.
New high-gain fluoro-sulfo-phosphate fiber and L-band fiber laser
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 rare-earth solubility,low luminescent efficiency,and low gain coefficient of silica fibers limit the laser performance.Obtaining an appropriate gain medium with excellent amplification capability in the L-band is a major challenge.A newly developed Er3+/Yb3 +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,Er3+/Yb3+co-doped FSP glass fiber has a high figure-of-merit(5.7×10-23 s cm2),broad gain bandwidth(49.7×10-27 cm3),and high net gain coefficients of 5.3 dB cm-1@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 long-wavelength amplification capability,which could provide solutions for the gain medium required by L-band ultrashort linear cavity fiber lasers.
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