自研20/400μm熊猫型掺镱保偏光纤实现3 kW高亮度窄线宽线偏振激光输出

A 3 kW High Brightness Narrow Linewidth Linearly-Polarized All-Fiber Amplifier Using Homemade 20/400μm Panda Yb-Doped Polarization-Maintaining Fiber

通过改进的化学气相沉积工艺和溶液掺杂技术成功制备出20/400μm大模场熊猫型掺镱保偏光纤并研究其激光性能。光纤的纤芯数值孔径为0.062,经截断法测量其976 nm处的包层吸收系数为1.4 dB/m。搭建了全光纤结构主振荡功率放大测试平台研究其光纤激光性能,当掺镱保偏光纤长度为15.3 m、弯曲直径10 cm时,在4.143 kW的976 nm泵浦功率下,实现了最高3.008 kW的窄线宽线偏振激光输出,输出激光光谱半峰全宽为0.213 nm,拟合斜率效率为75%,偏振消光比为16 dB,激光输出功率在2.009 kW时光束质量因子为1.19和1.2。结果表明,受激布里渊效应和受激拉曼效应均得到有效抑制。

Polarization-maintaining-ytterbium-doped double-clad fiber of 20μm diameter core and 400μm diameter clad size(PM-YDF 20/400μm)was fabricated using the modified chemical vapor deposition method and solution doping technology.The numerical aperture of the fiber core was 0.062,and the cladding absorption coefficient of the fiber at 976 nm was 1.4 dB/m,as measured using the truncation method.To examine the effectiveness of fiber laser performance,an all-fiber master oscillator power amplifier testing platform was used.The PM-YDF 20/400μm has a length of 15.3 m,and its bending diameter is 10 cm.Furthermore,a narrow linewidth linearly-polarized laser output of up to 3.008 kW is achieved using a pump power of 4.143 kW at 976 nm.The full width at half maximum linewidth is 0.213 nm,corresponding to a slope efficiency of 75%.At a laser output power of 2.009 kW,the polarization extinction ratio is 16 dB and the beam quality factor is 1.19 and 1.20.Moreover,stimulated Brillouin and Raman effects are effectively suppressed.