【作者】 张翔； 蔡青； 朱兴华；

【Author】 ZHANG Xiang, CAI Qing, ZHU Xing-hua (Department of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China)

【机构】 成都信息工程学院光电技术系；

【摘要】 用H-S(Hartmann-Shack)波前传感器可以精确测量穿过超声速流场的激光动态波面及其变化过程,进一步计算还可以获得光束质心漂移、远场分布等数据。讨论了利用H-S波前传感器测量穿过超声速流场激光波面的原理,并采用模式法进行波前重构,得到了在几种流场条件下的激光波面像差特性如PV和RMS、各阶Zernike像差系数,环围能量分布和Strehl比等。结果表明,采用H-S传感器进行测量、并用模式法进行波前重构可以较好反映流场建立、稳定和结束过程中各阶Zernike像差的变化。比较无流场和给定参数的超声速流场,激光穿越后产生的最明显变化为离焦A3和低阶像散A5的增大。更多还原

【Abstract】 The wavefront phase distribution and the dynamic wavefront change course during a period of time of laser beam traversing a supersonic flow can be measured by H-S (Hartmann-Shack) wave front sensor with the high special-resolving power. Through the analyzing and calculating the experimental data further, we can also obtain the centroid-drifting data of laser beams, laser beam focusing characteristic of far-field. In this paper, The principle of wavefront measurement of laser beam traversing a supersonic flow using the H-S wave front sensor is given briefly. The PV and RMS value of wavefront aberration is given by using mode-construction method. Each Zernike coefficient, circle energy and Strehl ratio of wavefront are also presented. Results show that the process of flow establishing, stabilizing and ending can be measured by H-S wavefront sensor. By contrasting no flow and with given conditional supersonic flow, the defocus aberration and astigmatism is increased notablely. There is the same conclusion with same supersonic flow condition by contrasting no the model and putting in the model in the flow.更多还原