Tapered tellurite step-index optical fiber for coherent near-to-mid-IR supercontinuum generation: experiment and modeling.
Tapered tellurite step-index optical fiber for coherent near-to-mid-IR supercontinuum generation: experiment and modeling.
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DOI：
10.1364/ao.58.000415
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发表时间：
2019-01
期刊：
影响因子：
1.9
通讯作者：
T. S. Saini;Nguyen Phuoc Trung Hoa;T. Tuan;Xing Luo;Takenobu Suzuki;Y. Ohishi
中科院分区：
文献类型：
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作者：
T. S. Saini;Nguyen Phuoc Trung Hoa;T. Tuan;Xing Luo;Takenobu Suzuki;Y. Ohishi
我们展示了在正常色散区，利用超快激光泵浦的短长度锥形亚碲酸盐阶跃折射率光纤产生宽带高相干近中红外超连续谱。锥形碲酸盐光纤在产生的超连续谱范围内具有全正常色散特性。利用一根3.2 cm长的锥形碲酸盐光纤，在峰值功率为19.8kW、泵浦功率为2μm的200fs激光脉冲的泵浦下，获得了跨度为1.2 8~3.31μm的高相干近中红外超连续谱，其几何参数和泵浦条件与实验所用的几何参数和泵浦条件相同。数值观测结果支持了实验结果。这项工作的结果表明，制作的锥形亚碲酸盐阶跃折射率光纤是一种很有前途的非线性介质，可以在较短的光纤长度内获得相干的近中红外超连续谱。
We demonstrate broadband highly coherent near-to-mid-IR supercontinuum generation using a short length of tapered tellurite step-index fiber pumped with an ultrafast laser in normal dispersion regime. The tapered tellurite fiber possesses all-normal dispersion characteristics within the whole range of the generated supercontinuum spectrum. A highly coherent near-to-mid-IR supercontinuum spectrum spanning 1.28 to 3.31 μm at a -40 dB intensity level is obtained using a 3.2 cm long tapered tellurite fiber when it is pumped with a 200 fs laser pulse with a peak power of 19.8 kW at 2 μm. To obtain the supercontinuum spectrum, we also carried out numerical modeling for the tapered tellurite step-index fiber with the same geometrical parameters and pump conditions used in the experiment. The numerical observation supports the experimentally obtained result. The findings of this work show that the fabricated tapered tellurite step-index fiber is a promising nonlinear medium to obtain a coherent near-to-mid-IR supercontinuum spectrum in a short length of the fiber.