基于粉末烧结技术制备镱铝共掺大模场光子晶体光纤

Abstract

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.