1.94 um波段Tm:Ho共掺石英基全光纤飞秒脉冲激光技术研究

项目名称： 1.94 um波段Tm:Ho共掺石英基全光纤飞秒脉冲激光技术研究

项目编号： No.61275091

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 延凤平

作者单位： 北京交通大学

项目金额： 88万元

中文摘要： 飞秒激光可以进行高质量、高重复性和无碎屑的烧蚀加工，在军事和民用方面具有广阔的应用前景。本课题研究Tm:Ho/Tm:Ho:Tb共掺石英基光纤在1.94 um波段OH-吸收窗口的辐射特性，利用交叉驰豫及上转换机理提高Tm3+、Ho3+对泵浦光的吸收效率。优化疏松层高掺Ge、F、Tm3+、Ho3+以及包层环形掺Tb3+工艺，提高光纤的增益特性和磁光特性。采用MCVD车床的"湿法"在线掺杂技术和光纤预制棒侧向开槽技术，制作偏振保持Tm:Ho/Tm:Ho:Tb共掺石英基光纤。基于非线性偏振旋转机制并精确控制色散，在793nm激光泵浦下，运转在呼吸锁模状态，形成稳定的高能量(nJ量级)、高重复频率(约100MHz)的飞秒激光脉冲输出(脉宽百fs量级)。为实现利用1.94 um波段飞秒激光对材料进行高质量高重复性的微细加工和外科手术奠定基础。

中文关键词： 飞秒光纤激光器；1.94 um；全光纤；Tm: Ho共掺；

英文摘要： Femtosecond laser enable to be used for high-quality high-repeatability no-fragment ablation, are of great interest in both military and civil areas. We have studied the absorption characteristics of OH- in the Tm:Ho/ Tm:Ho:Tb co-doped silica fiber within 1.94um wavelength range, and the methods to increasing the pump efficiency of Tm3+,Ho3+ by incorperating cross-relaxation and up-conversion. To improve the characteristic of gain and magneto-optic effect, we will optimize the parameters of high-doping process of Ge, F, Tm3+, Ho3+, and cladding-doping process of Tb3+. Meanwhile, polarization-maintain Tm:Ho/ Tm:Ho:Tb silica fiber perform is fabricated by MCVD, special solution doping technique and side-groove method. Based on Nonlinear polarization rotation (NPR) and precise dispersion management, a stable high-energy (~nJ), high-repetition(~100MHz), narrow-pulse-width(~100fs) femtosecond all-fiber laser operating in the streched- pulse regime at 1.94um will be obtained by pumping at 793nm. It has great potential of the application in high-quality high-repeatability micro-fabrication and surgery.

英文关键词： femtosecond fiber laser；1.94 um；all fiber；Tm:Ho co-doped；