Optimization of adaptive nonlinear aspherical microlens using ZEMAX

Abstract

This paper presents a comprehensive analysis of a thin plate of nonlinear medium (TPNM) irradiated by a laser Gaussian beam (LGB), which functions as a tunable nonlinear aspherical micro lens (NAML). When positioned at the beam waist of the LGB, the TPNM behaves as a Kerr-based lens with variable curvature and conic coefficient. Analytical expressions for the vertex curvature radius and conic coefficient are derived based on design parameters such as beam waist radius, peak intensity, nonlinear coefficient of refractive index, and physical thickness of TPNM. To verify and optimize lens performance, the optical design software ZEMAX is employed to extract and evaluate optical aberration, spot diagrams, and wavefront error. The optimization significantly reduces aberrations, spot size, and wavefront error, thereby enhancing imaging quality. The results confirm the feasibility of using NAMLs in complex optical systems requiring adaptive aberration control, making them suitable for integration into compact, high-resolution optical platforms.