一种基于离轴椭球面的小光程差波面整形系统

Wavefront shaping system of tiny optical path difference based on off-axis ellipsoidal surface

为了实现空间中一定距离的近似等光程光束传输,设计了一种包含离轴椭球面反射镜的波面整形系统。基于几何光学与初级像差理论,结合Zemax光学设计软件,分析了椭球面反射镜圆锥系数、离轴量对像面处光程差的影响;设计了平面-椭球面反射镜和双椭球面反射镜2种光学结构的波面整形系统,并比较了2种结构的公差。分析结果表明:平面-椭球面反射系统和双椭球面反射系统均实现了空间中1 m距离的光束传输,且2种结构系统在3 mm物高视场和孔径角为6°条件下,各视场光瞳之间的光程差分别为0.14 mm和0.04 mm,因此,双椭球面反射结构整形效果优于平面-椭球面反射系统,但双椭球面反射结构对公差的敏感度更高。

In order to realize the optical beam transmission with approximately equal optical path for a certain distance in space,a newly-designed wavefront shaping system with off-axis ellipsoidal reflector was proposed.On the basis of the geometric optics and primary aberration theory,the influences of conic coefficients and off-axis amounts of the ellipsoidal reflector on the optical path difference of the image plane were analyzed in optical design software Zemax,the wavefront shaping systems of two kinds of optical structures of planar-ellipsoidal reflector and double ellipsoidal reflector were designed,and the tolerances of the two structures were compared.The analysis results show that both the planar-ellipsoidal reflective system and the double ellipsoidal reflective system realize the optical beam transmission at a distance of 1 m in space,and the optical path difference between each field of view pupil is 0.14 mm and 0.04 mm,respectively,under the condition of 3 mm object height field of view and aperture angle of 6°.Therefore,the shaping effect of the double ellipsoidal reflective structure is better than that of the planar-ellipsoidal reflective system,but the double ellipsoidal reflective structure is more sensitive to the tolerances.