Parry Jonathan P, Shephard Jonathan D, Thomson Martin J, Taghizadeh Mohammad R, Jones Julian D C, Hand Duncan P
Department of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK.
Appl Opt. 2007 Jun 10;46(17):3432-8. doi: 10.1364/ao.46.003432.
Fiber delivery of 64.7 mJ laser pulses (approximately 6 ns duration) from a Q-switched Nd:YAG laser operating at 532 nm is demonstrated. A custom diffractive optical element was used to shape the laser beam and facilitate coupling into a linear fiber array. This launch arrangement achieves an improvement in launch efficiency compared with a circular fiber bundle evaluated in previous work and the delivery of higher pulse energies is demonstrated. The bundle is capable of delivering light of sufficient pulse energy and, importantly, with suitable focusability, to generate a thin light sheet for the fluid flow measurement technique of particle image velocimetry (PIV). Fiber delivery offers an advantage, in terms of optical access, for the application of PIV to enclosed measurement volumes, such as the cylinder of a combustion engine.
展示了从工作波长为532nm的调Q Nd:YAG激光器光纤传输64.7mJ的激光脉冲（持续时间约6ns）。使用定制的衍射光学元件对激光束进行整形，并便于耦合到线性光纤阵列中。与先前工作中评估的圆形光纤束相比，这种发射装置实现了发射效率的提高，并展示了更高脉冲能量的传输。该光纤束能够传输具有足够脉冲能量且重要的是具有合适聚焦能力的光，以产生用于粒子图像测速（PIV）流体流动测量技术的薄光片。就光学接入而言，光纤传输为将PIV应用于封闭测量体积（如内燃机气缸）提供了优势。
