基于粉末烧结技术制备镱铝共掺大模场光子晶体光纤

Fabrication of Yb^(3+)/Al^(3+) Co-doped Large-mode-area Photonic Crystal Fiber Based on Powder Sintering Technology

采用粉末烧结技术制备出高浓度镱铝共掺石英棒,Yb3+掺杂浓度为12 000ppm(wt).利用此掺镱石英棒作为纤芯,拉制出镱铝共掺大模场光子晶体光纤,光纤模场面积为550μm2,模场直径26μm.实验结果表明:光纤在近红外波段(850～1 033nm)出现一个宽的吸收带,主吸收峰波长位于976nm,在此波长处吸收损耗高于10dB/m;采用波长为971nm的激光泵浦光纤,在1 050～1 125nm波长范围内产生高斯型的荧光峰,峰值波长位于1 088nm处,荧光半宽高45nm.

Based on powder sintering technology,Yb3+/Al3+ co-doped silica rods are prepared,and the concentration of Yb3+ is up to 12 000 ppm(wt).Then,with the Yb3+/Al3+ co-doped silica rods as core materials,highly doped Large-mode-area Photonic Crystal Fibers(LMA-PCF) are fabricated by stack-draw method.The mode area can reach 550 μm2,and the mode field diameter is 26 μm.The results indicate that the fiber has a broad absorption band in the near infrared wavelength(850~1 033 nm),and the main peak is at the wavelength of 976 nm where the absorption loss is higher than 10 dB/m;when the fiber is pumped by the laser with a wavelength of 971 nm,there exists a Gaussian fluorescence peak in the wavelength range of 1 150~1 125 nm,with a peak value of 1 088 nm and a half-line width of 45 nm.