光谱学与光谱分析, 2017, 37 (4): 1215, 网络出版: 2017-06-20   

高非线性光子晶体光纤深紫外超连续谱的研究

Deep Ultraviolet Supercontinuum Study in the Highly Nonlinear Photonic Crystal Fiber
作者单位
1 燕山大学信息科学与工程学院, 河北 秦皇岛 066004
2 燕山大学河北省特种光纤与光纤传感重点实验室, 河北 秦皇岛 066004
摘要
光子晶体光纤作为光学非线性良好介质, 对超连续谱产生具有重要作用。 深紫外超连续谱光源在许多应用中有急切的需求, 然而由于实验条件和光纤参数等方面的影响, 利用高非线性光子晶体光纤产生深紫外(<280 nm)超连续谱的报道较少。 通过理论和实验研究了高非线性光子晶体光纤在深紫外区的频率变换, 并分析其产生的物理机理。 使用钛宝石飞秒激光器将实验室自制的光子晶体光纤在反常色散区泵浦, 研究了不同泵浦功率和泵浦波长对深紫外区超连续谱的影响, 结果表明: 泵浦波长固定为860 nm时, 深紫外频率光谱展宽范围随泵浦功率的增加而逐渐展宽; 泵浦功率固定为0.4 W时, 泵浦波长的增加不仅展宽超连续谱范围而且极大的提高了深紫外区光谱的转换效率。 当泵浦波长为870 nm, 泵浦功率为0.4 W, 实验所用光子晶体光纤长度为1.45 m, 零色散波长为825 nm时, 光子与色散波的交叉相位调制使深紫外基模超连续谱扩展到最短波长212 nm。
Abstract
Photonic crystal fiber is a good nonlinear medium which plays an important role in generating supercontinuum. Deep ultraviolet supercontinuum light sources in many applications have urgent needs, but due to the influence of experimental conditions and fiber parameters, using highly nonlinear photonic crystal fiber produced deep ultraviolet supercontinuum (<280 nm) has reported less. In this paper, we study the frequency conversion of high nonlinear photonic crystal fiber in the deep ultraviolet region, and analyze its physical mechanism through theoretical and experimental. Photonic crystal fiber with length of 1.45 m and the zero dispersion wavelength of 825 nm made in our lab is pumped by the femtosecond Ti: sapphire laser in the abnormal region and the dependences of deep ultraviolet supercontinuum on the different pump powers and pump wavelengths are investigated. The experiment results show that when the pump wavelength is fixed to 860 nm, the broadening range of deep ultraviolet supercontinuum is gradually broadened with the increase of pump power; when the pump power is fixed to 0.4 W, the cross-phase modulation between the solitons and the dispersive waves can effectively extend the fundamental mode deep ultraviolet supercontinuum into the wavelength of 212 nm. The increase of pump wavelength not only broadens supercontinuum range but also greatly improves the conversion efficiency of deep ultraviolet supercontinuum.

杨建菊, 韩颖, 王伟, 周桂耀, 赵兴涛, 侯蓝田, 屈玉玮, 牛静霞. 高非线性光子晶体光纤深紫外超连续谱的研究[J]. 光谱学与光谱分析, 2017, 37(4): 1215. YANG Jian-ju, HAN Ying, WANG Wei, ZHOU Gui-yao, ZHAO Xing-tao, HOU Lan-tian, QU Yu-wei, NIU Jing-xia. Deep Ultraviolet Supercontinuum Study in the Highly Nonlinear Photonic Crystal Fiber[J]. Spectroscopy and Spectral Analysis, 2017, 37(4): 1215.

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