Controlling Spherical Aberration of Nonlinear Aspherical Micro Lens

In this paper, we have proved that a thin plate of the nonlinear medium (TPNM) irradiated by the laser Gaussian beam (LGB) can operate as the nonlinear aspherical lens. When placed at the beam waist, the TPNM acts as a tunable aspherical lens. The expressions of the curvature radius at the vertex, conic coefficient, and spherical aberration (SA) are clearly approximately derived. They depend on the design parameters such as the peak intensity, waist radius of the laser beam, thickness, and nonlinear coefficient of the medium. The dependence of curvature radius, conic coefficient, and spherical aberration on average power is numerically analyzed. The investigated results give us the opportunity to choose the expected average power of the LGB to have the flexible conic coefficient. It is the background condition for the adaptive correction of the optical aberration of the complex optical system concluding the nonlinear aspherical micro lens (NAML).