对液晶波前校正器的色散问题进行了研究,测定了250D离焦、250D像散两种像差镜和650 nm、670 nm、710 nm、840~860 nm、835~865 nm、830~870 nm五种滤光片下的色散.结果表明：可见到近红外波段内20~30 nm带宽的光是液晶自适应光学系统的理想光源,可实现系统较大的能量利用率和较小的色散.对于中心波长850 nm的近红外光,当光源的带宽低于30 nm时,LCOS的色散对系统像差影响较小,可以忽略,系统的光能利用率又较大；一旦光源带宽高于40 nm,LCOS的色散会对系统的像差产生明显的影响,使成像分辨率大大降低.

The research on the dispersion of liquid crystal wavefront correctors is introduced,using the lens of 250D focus,250D astigmatism and the narrow band filter of 650 nm,670 nm,710 nm,840~860 nm,835~865 nm,830~870 nm.For the 850 nm near-infrared light,when the waveband below 30 nm,the dispersion of liquid crystal wavefront correctors has little affect to the system,which can be working with high energy; when the waveband over 40 nm,the affect will not be overlooked.Dispersion of liquid crystal of visible light is almost the same as near-infrared.As conclusion,the waveband that the liquid crystal wavefront correctors may correct with high energy and small dispersion is assured to be 30nm to 40 nm at visible range.