自研万瓦级同带泵浦掺镱石英玻璃光纤

Homemade 10-kW Ytterbium-Doped Aluminophosphosilicate Fiber for Tandem Pumping

同带泵浦具有泵浦源亮度高、量子亏损低等优点,是实现光纤激光器功率提升的有效措施。采用稀土螯合物全气相掺杂技术和改进的化学气相沉积工艺(MCVD)制备了适用于同带泵浦的镱掺杂铝磷硅体系光纤。所研制的50/400光纤构建的全光纤结构主振荡功率放大器采用同带泵浦方式,实现了9.82 kW的激光功率输出,激光中心波长为1080.08 nm,3 dB带宽为1.62 nm,斜率效率为86.8%。研究结果表明镱掺杂的铝磷硅光纤激光材料是同带泵浦高功率光纤激光系统的优选增益介质,稀土螯合物全气相掺杂技术和MCVD是获得该种材料的有效手段。

Tandem pumping is characterized by high pump-source brightness and low quantum defect, which are beneficial for power scaling of fiber laser. By combining the modified chemical vapor deposition(MCVD) method with the chelate precursor doping technique, we fabricated an ytterbium(Yb)-doped aluminophosphosilicate fiber suitable for tandem pumping. Laser performances of the fiber were demonstrated in an all-fiberized master oscillator power amplifier(MOPA) laser system. Tandem pumped by 1018 nm fiber laser, 9.82 kW laser output at 1080.08 nm has been achieved with 86.8% slope efficiency. The 3-dB bandwidth is 1.62 nm at the maximum laser power. Our results indicate that the Yb-doped aluminophosphosilicate laser material is the optimal gain medium for the tandem pumping of high-power fiber laser systems. The chelate precursor doping technique combined with MCVD is an effective method for obtaining this type of material.