Fibre optic beam delivery system for high peak power laser PIV illumination
Fibre optic beam delivery system for high peak power laser PIV illumination
复制标题
用于高峰值功率激光 PIV 照明的光纤光束传输系统
DOI：
10.1088/0957-0233/10/3/021
复制
发表时间：
1999
影响因子：
2.4
通讯作者：
J. Jones
中科院分区：
文献类型：
--
作者：
D. Hand;J. Entwistle;R. Maier;A. Kuhn;C. Greated;J. Jones
衍射光学元件（DOE）用于将Q开关和倍频Nd：YAG激光束耦合到光纤中，以实现显著提高的损伤阈值，从而实现光纤光束传输，用于高速粒子图像测速（PIV）测量。对于单光纤传输系统，与使用常规光学器件在532 nm处的m芯直径光纤中可达到10 mJ的最佳值相比，可传输的最大脉冲能量密度增加了5-10倍。我们还将DOE布置应用于我们先前开发的束输送系统，包括19米芯直径的光纤。在测试中，超过1000个能量为30 mJ的脉冲被成功传输，没有任何损坏的迹象。这使得光纤传输成为许多气流PIV应用的一个实用选项，如这里通过测量方形管道中的流量所展示的那样。
Diffractive optical elements (DOEs) are used to couple Q-switched and frequency-doubled Nd:YAG laser beams into optical fibres to achieve significantly increased damage thresholds, enabling fibre optic beam delivery for high-speed particle image velocimetry (PIV) measurements. For single fibre delivery systems, the maximum pulse energy density that can be transmitted is increased by a factor of 5-10 compared with the best that can be achieved using conventional optics, of up to 10 mJ in a m core diameter fibre at 532 nm. We also applied the DOE arrangement to our previously developed bundle delivery system, comprising nineteen m core diameter fibres. On testing, over 1000 pulses with energies of 30 mJ were successfully transmitted, with no indication of damage. This allows fibre delivery to become a practical option for many air-flow PIV applications, as demonstrated here with measurements of flow in a square duct.