Yb-doped aluminophosphosilicate ternary fiber with high efficiency and excellent laser stability

• Published in: Optical fiber technology Vol. 41; pp. 7 - 11
• Main Authors: Li, Yuwei, Peng, Kun, Zhan, Huan, Liu, Shuang, Ni, Li, Wang, Yuying, Yu, Juan, Wang, Xiaolong, Wang, Jianjun, Jing, Feng, Lin, Aoxiang
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.03.2018
• Subjects: Fiber design and fabrication; Fiber laser; Modified chemical vapor deposition; Yb-doped aluminophosphosilicate fiber; Modified chemical vapor deposition; Yb-doped aluminophosphosilicate fiber; Fiber design and fabrication; Fiber laser
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2017.12.011

•We fabricated Yb-doped aluminophosphosilicate ternary large-mode-area fiber and demonstrated its laser performances.•Laser output power is 1.02 kW with a high slope efficiency of 81.2%.•Output laser had excellent stability with power fluctuation less than 1.1% for over 10 h.•We compared ternary fiber with binary fiber, indicating the obvious advantages of the former over the latter. By using chelate precursor doping technique and traditional modified chemical vapor deposition system, we fabricated Yb-doped aluminophosphosilicate (Al2O3-P2O5-SiO2, ternary Yb-APS) large-mode-area fiber and reported on its laser performance. The fiber preform was doped with Al, P and Yb with concentration of ∼8000 ppm, ∼1700 ppm and ∼400 ppm in molar percent, respectively. Tested with master oscillator power amplifier system, the home-made Yb-APS fiber was found to present 1.02 kW at 1061.1 nm with a high slope efficiency of 81.2% and excellent laser stability with power fluctuation less than ±1.1% for over 10 h. Compared with Yb-doped aluminosilicate (Al2O3-SiO2, binary Yb-AS) fiber, the introduction of P2O5 effectively suppressed photodarkening effect even the P/Al ratio is much less than 1, indicating that Yb-APS fiber is a better candidate for high power fiber lasers.