Department;
of;
Optical;
Engineering,;
Beijing;
Institute;
of;
Technology,;
Beijing;
100081,;
China;
Department;
of;
Precision;
Instruments;
and;
Mechanology,;
Tsinghua;
University,;
Beijing;
100084,;
China;
China;
North;
Industries;
Group;
Corporation,;
Beijing;
100089,;
China;
Department;
of;
Precision;
Instruments;
and;
Mechanology,;
Tsinghua;
University,;
Beijing;
100084,;
China;
optical; fabrication,; computer; controlled; optical; surfacing,; free-form; lens,; finite; Fourier; coefficient,; error; correction.;