Bui Xuan Kien, Pham Thanh Quang, Tran Quoc Tuan

Main Article Content

Abstract

A nonlinear aspherical micro-lens (NAML) can be dynamically formed inside a Kerr medium under Gaussian beam (GB) illumination, providing an intensity-dependent optical surface that enables adaptive wavefront control. While previous studies have clarified the formation mechanism and spherical aberration of the NAML, the behavior of off-axis coma has not yet been fully investigated. In this work, we derive the complete third-order coma expression of the NAML by combining the nonlinear refractive-index distribution with the Seidel aberration formulation. The dependence of coma on the average laser power, nonlinear-layer thickness, and incident ray angle is examined through numerical simulations. The results show that the aspheric coma component dominates and scales strongly with , leading to substantial wavefront distortion at large power, thickness, or field angle. A practical operating window is identified in which the coma remains within a few wavelengths. These findings establish the NAML as a power-tunable micro-optical element capable of partial off-axis aberration control.

Keywords: Nonlinear optics; Aspherical micro lens; Conic coefficient; Aberration optimization.

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