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针对普通焦距测量方法无法对单脉冲高能激光热畸变引起的焦斑轴向位置漂移进行测量的问题,设计了一种由正交双楔板组分束、可实现瞬时焦斑位置测量的光斑列阵检测系统。两组垂直放置的楔板反射镜组对汇聚光束进行空间分束调制,不同光束具有不同汇聚位置。这些光束最终被探测器接收,形成尺寸不同、阵列分布的光斑阵列。通过对光斑阵列的单次探测,实现了多种轴向焦斑位置变化量的获取及单发次高能激光脉冲系统的焦斑漂移测量。经过理论分析、软件模拟及具体实验验证,该测量系统具有测量范围与测量精度可调、光斑离散性好、杂散光影响小等特点。
Aiming at the problem that the ordinary focal length measurement method can not measure the axial position drift caused by the thermal aberration of single-pulse high-energy laser, a spot beam array with orthogonal double wedge assembly beam to measure the position of instantaneous focal spot Array detection system. Two groups of wedge mirrors, which are placed vertically, perform spatial beam splitting on the convergent beam, and different beams have different convergence positions. These beams are eventually received by the detector to form arrays of light spots that are different in size and arrayed. Through the single detection of the light spot array, a variety of axial focal spot position change amount acquisition and single-shot secondary high-energy laser pulse system focal spot drift measurement. After theoretical analysis, software simulation and specific experimental verification, the measurement system has the advantages of adjustable measurement range and measurement accuracy, good spot dispersion and little influence of stray light.