大口径长焦透镜是高功率激光系统中必不可少的器件之一，随着装置性能提升，对长焦透镜透射波前包括透射峰谷(PV)值、透射均方根梯度(GRMS)值等，提出了详细的定量技术指标需求。根据长焦透镜焦距特别长的特点，提出了利用准直透镜，大幅缩短长焦透镜检测光路距离干涉检测方法。利用Zemax 软件分析了该检测方法的理论误差和调整误差。该检测方法将光路长度由13 m(或33 m)，大幅缩短至约5 m，光路受环境温度梯度、气流、震动的影响大幅降低，干涉结果直接显示透射波前畸变。

Large aperture long focal length lens is one of the necessary optics in the high power laser device.Along with the device upgrading, it proposes detailed transmission wavefront including transmission peak valley (PV)、 transmission root mean square gradient (GRMS) for long focal length lens. According to the long focal length characteristic, this paper put forward an interference detection method, which utilizes a collimatied lens and a compensative lens to shorten the optical path length of the long focal lens detection and compensate the theoretical sphere aberration. Zemax is utilized to analyze and optimize the theoretical error and the distance adjustment error of the detection method.This method significantly shorten the optical path length of the long focal lens detection from 13 m (or 33 m) to about 5 m. The results show the transmission wavefront aberration of the tested lens.