Based on the theory of scalar diffraction and on the Fourier optics, a formula of the diffractive efficiency with alignment error for the 4 step Fresnel lens is obtained.

• 摘要基于标量衍射理论，在傅立叶光学的基础上，首先得出存在对准误差情况下4台阶菲涅耳透镜衍射效率的解析式；