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提出使用128×128元液晶微透镜阵列取代传统固定焦距的微透镜阵列,实现了一种可电控自适应调节的夏克-哈特曼波前传感器。该传感器克服了传统波前传感器无法兼顾测量范围与测量精度的缺点,可工作在大测量范围/短焦距与高测量精度/长焦距两种模式下,并可自由切换。通过实验测量,该波前传感器调至短焦距工作模式时其焦距调谐范围为86~400μm,调至长焦距工作模式时其调制传递函数在0.46以上。并通过对焦点落于CCD有效区域外的极端情况进行实验验证,表明该波前传感器具有一定电控自适应调节能力,在自适应光学系统中具有较大的应用潜力。
A 128 × 128 liquid crystal microlens array is proposed to replace the traditional fixed focal length microlens array to realize a Shack-Hartmann wavefront sensor which can be electrically controlled and adaptively adjusted. The sensor to overcome the traditional wavefront sensor can not take into account the measurement range and measurement accuracy of the shortcomings can work in the large measurement range / short focal length and high measurement accuracy / long focal length two modes, and can be switched freely. Through experimental measurements, the focal length tuning range of this wavefront sensor is 86 ~ 400μm when it is adjusted to short focal length working mode, and its modulation transfer function is above 0.46 when it is adjusted to long focal length working mode. The experimental results show that the wavefront sensor has a certain electric adaptive control ability and has great potential in adaptive optics system.