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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。
The H-S (Hartmann-Shack) wavefront sensor can accurately measure the laser dynamic wave surface and its changing process through the supersonic flow field, further calculation can also get the beam center of mass drift, far-field distribution and other data. The principle of using the HS wavefront sensor to measure the laser wavefront through the supersonic flow field is discussed, and the wavefront reconstruction by the mode method is carried out. The laser wavefront aberration characteristics such as PV and RMS under several flow field conditions are obtained. Zernike aberration coefficient, surrounding energy distribution and Strehl ratio. The results show that using the H-S sensor to measure and using the modal method to reconstruct the wave front can better reflect the changes of the Zernike aberrations of each stage during the process of establishing, stabilizing and ending the flow field. Comparing the supersonic flow field with no flow field and given parameters, the most obvious change after laser traversing is the increase of defocus A3 and low-order astigmatism A5.