具有旋光性硅酸镓镧晶体的高效高重复率电光调Q激光器。

Efficient high repetition rate electro-optic Q-switched laser with an optically active langasite crystal.

作者信息

Ma Shihui, Yu Haohai, Zhang Huaijin, Han Xuekun, Lu Qingming, Ma Changqin, Boughton Robert I, Wang Jiyang

机构信息

State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China.

Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.

出版信息

Sci Rep. 2016 Jul 27;6:30517. doi: 10.1038/srep30517.

DOI:10.1038/srep30517

PMID:27461819

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4962309/

Abstract

With an optically active langasite (LGS) crystal as the electro-optic Q-switch, we demonstrate an efficient Q-switched laser with a repetition rate of 200 kHz. Based on the theoretical analysis of the interaction between optical activity and electro-optic property, the optical activity of the crystal has no influence on the birefringence during Q-switching if the quarter wave plate used was rotated to align with the polarization direction. With a Nd:LuVO4 crystal possessing a large emission cross-section and a short fluorescence lifetime as the gain medium, a stable LGS Q-switched laser was designed with average output power of 4.39 W, corresponding to a slope efficiency of 29.4% and with a minimum pulse width of 5.1 ns. This work represents the highest repetition rate achieved so far in a LGS Q-switched laser and it can provide a practical Q-switched laser with a tunable high repetition rates for many applications, such as materials processing, laser ranging, medicine, military applications, biomacromolecule materials, remote sensing, etc.

摘要

以旋光性硅酸镓镧（LGS）晶体作为电光Q开关，我们展示了一种重复频率为200 kHz的高效调Q激光器。基于光学活性与电光特性相互作用的理论分析，如果使用的四分之一波片旋转至与偏振方向对齐，则晶体的光学活性在Q开关过程中对双折射没有影响。以具有大发射截面和短荧光寿命的Nd:LuVO4晶体作为增益介质，设计了一种稳定的LGS调Q激光器，其平均输出功率为4.39 W，斜率效率为29.4%，最小脉冲宽度为5.1 ns。这项工作代表了迄今为止LGS调Q激光器所实现的最高重复频率，并且它可以为许多应用提供具有可调高重复频率的实用调Q激光器，如材料加工、激光测距、医学、军事应用、生物大分子材料、遥感等。