1 中国科学院 光电研究院 国家半导体泵浦激光工程技术研究中心, 北京 100094
2 中国科学院大学, 北京 101407
3 俄罗斯科学院 光纤研究中心, 莫斯科 119333,俄罗斯
为了实现对飞秒激光器产生的超短脉冲的进一步压缩, 对近年来出现的一种新型负曲率空芯光纤展开了研究, 并基于该光纤对800 nm飞秒激光进行了压缩实验。首先介绍了一种圆形玻璃管包层结构的负曲率空芯光纤, 通过有限元方法对光纤的损耗特性进行计算, 并与实验测试结果进行对比。然后利用广义非线性薛定谔方程对脉冲在光纤中的传输进行了模拟仿真。最后利用该光纤进行了超短脉冲压缩实验, 将脉冲宽度为160 fs的钛宝石飞秒激光耦合进一段充高压氩气的圆形玻璃管包层结构的负曲率空芯光纤, 通过光纤内反常色散和自相位调制的共同作用, 得到84 fs的输出, 实现脉冲的压缩, 实验结果与仿真计算一致。这种新型的负曲率空芯光纤损伤阈值高、色散、非线性系数小且灵活可调, 非常适用于超快领域研究。
负曲率 空芯光纤 脉冲压缩 negative-curvature hollow-core fiber pulse compression
Author Affiliations
Abstract
1 Institute of Laser & Opto-electronics, College of Precision Instruments and Opto-Electronic Engineering, Tianjin University, Tianjin 300072, China
2 Laboratory Center for Precision Instrument & Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
3 Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology, Shijiazhuang University of Economics, Shijiazhuang 050031, China
4 College of Physical Science, Qingdao University, Qingdao 266071, China
An effective mode selection is important for the multi-core photonic crystal fiber (PCF) to obtain good output. Talbot cavity is popular to lock the in-phase mode, but few satisfactory experimental results have been reported. In this paper, a dual-Talbot cavity with reflected mirrors on each side of PCF is designed to lock the in-phase mode. The design gains the advantage of in-phase mode against out-of-phase mode. What’s more, it can weaken the influence brought by the imperfect end facet of the fiber. The corresponding theoretical analyses and the experiment are taken. The experimental results suggest that the dual-Talbot cavity improves the capacity of mode selection.
光电子快报（英文版）
2014, 10(1): 59
