A system of three mirrors was proposed for beam shaping. This assembly of mirrors can convert a Gaussian distribution spot into a uniform linear distributed toroidal surface with conic and high order terms. Standard surfaces were utilized to control the beam propagation direction and energy distribution. The default merit function and optical modeling were combined to incorporate operands to optimize the systems efficiency. Rectangular and line fields with uniform energy distribution in one direction were successfully demonstrated. This has direct application to illumination or scanning in optical coherence tomography. In the case of the latter, the line is linear within a specific scanning range of 10 mm×11 mm of the first mirror. It can be concluded that this system can facilitate a simpler CT setup and is effective over a wide range of wavelengths.