双包层掺Yb3+光纤激光器的关键技术

大功率光纤激光器作为第三代激光器的代表,在激光加工和激光武器方面有着重要应用.介绍了掺Yb3+光纤激光器的发展历程,理论上分析了光纤激光器的泵浦阈值和输出功率,讨论了实验过程中涉及到的大功率LD泵浦、光纤耦合和双包层光纤等关键技术,为同类激光器的改进设计和深入研究提供参考.     

Dual-wavelength stable nanosecond pulses generation from cladding-pumped fiber laser

In this paper, the generation of dual-wavelength stable nanosecond pulses by a laser diode pumped Yb-doped double-clad fiber laser is presented. In the experiment, the fiber laser with two-mirror cavity is approved which operates in a self-Q-switching regime. The Q-switching mechanism is based on stimulated Brillouin scattering (SBS). When the pump power achieves the SBS threshold, the fiber laser changes from the start resonator to the SBS resonator. With different reflectivities of the second mirror, stable dual-wavelength pulses with the pulse width range from 10 ns to less than 2 ns are obtained. The result was explained theoretically by birefringency (including stochastic birefringency and bend birefringency).     

包层泵浦掺镱光纤激光器的理论和实验研究

从包层泵浦光纤激光器的速率方程理论出发,推导出了稳态下包层泵浦光纤激光器的输出功率,斜率效率和阈值功率的解析表达式,进行了数值模拟,对模拟结果进行了简单分析。并进行了实验研究,实验采用中心波长为975nm的激光二级管单端泵浦内包层形状为D型的包层光纤,利用二相色镜和光纤端面反馈构成谐振腔,采用了两套不同的准直耦合系统,得到的最高输出功率为24W,总的光-光转换效率为53.5%。     

光学系统像差与光场干涉对激光参量测量精度的影响

研究了采用面阵CCD探测器测量光束参量的技术问题,研制了一套高精度激光参量测量系统,对其光学系统像差与光场干涉原因进行了理论分析,实验测量了连续抽运1064nm固体模式发生器产生的基模厄米高斯光束,分析对比了其输出光束带有干涉条纹时对测量精度的影响,对光学系统的设计提出了具体技术要求,为同类装置的研制提供了参考依据。