Method for acquiring point path of off-axis aspheric optical element

The invention provides a method for acquiring a point path of an off-axis aspheric optical element. The method comprises the following steps: S1, constructing a curved surface equation under a mother mirror coordinate system according to initial parameters of the off-axis aspheric optical element; s2, calculating an edge height difference value through a dichotomy, and iterating a theta deflection angle when the workpiece is equal in thickness; s3, establishing a sub-mirror coordinate system according to the center height of the sub-mirror, and calculating a curved surface expression of the surface of the off-axis aspheric optical element under the sub-mirror coordinate system through translation and rotation transformation of a space coordinate system; and S4, under the sub-mirror coordinate system, performing calculation to obtain surface type points and normal features of the off-axis aspheric surface. According to the method, the coordinate transformation matrix is utilized to directly obtain the surface