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通过动态蒸馏提纯技术制备了高纯Ge-As-Se和Ge-As-S硫系玻璃。采用两步棒管法拉制了以Ge-As-Se玻璃为纤芯、Ge-As-S玻璃为包层的小芯径阶跃折射率光纤,并使用飞秒激光抽运光纤测试了超连续谱的产生。以Al和GaCl_3分别作为除氧剂和C/H纯化剂可以有效消除玻璃中的C、H和O杂质。制备的Ge As Se/Ge As S光纤在2~9μm波段表现出优异的传输性能,光纤数值孔径约为1.3;采用重复频率为10.5 MHz、脉冲宽度为320 fs、中心波长为4.0μm、峰值功率为4.6 k W激光抽运长度为22 cm、芯径为6μm的光纤,获得了覆盖1.9~8.2μm、光谱平坦度为±10 d B、平均功率为4.5 m W的超连续谱。
High-purity Ge-As-Se and Ge-As-S chalcogenide glasses were prepared by dynamic distillation. A two-step rod-tube method was used to fabricate a small core-step index optical fiber with Ge-As-Se glass as core and Ge-As-S glass as cladding. The supercontinuum Spectrum generation. Taking Al and GaCl_3 respectively as oxygen scavenger and C / H purifier can effectively eliminate C, H and O impurities in glass. The prepared Ge As Se / Ge As S optical fiber exhibits excellent transmission performance in the 2 to 9 μm wavelength band with an optical fiber with a numerical aperture of about 1.3, a repetition frequency of 10.5 MHz, a pulse width of 320 fs and a center wavelength of 4.0 μm. The peak power For a 4.6 k W laser pump with a fiber length of 22 cm and a core diameter of 6 μm, a supercontinuum was obtained covering 1.9 ~ 8.2 μm, spectral flatness ± 10 d B and average power 4.5 mW.