• Submicron lithography emphasis centers on focus latitude enhancement exposure (FLEX) and depth-of-focus engineering, using multi-plane exposures and focus-tolerance modelling to widen process windows and mitigate resist-related variations [19], [12], [11], [13].

• Adaptive-optics research converges on performance metrics, wavefront reconstruction, and active control in astronomical applications, with analyses of mean-square residual phase error, Strehl, and beam-quality under laser guide stars, plus detector-optimization studies for Shack-Hartmann sensors [15], [16], [3].

• Optical surface metrology emphasizes standardized scattering measurement, correcting for integrating-sphere errors, and wide-ranging scatter from topography via massively parallel simulations and advanced reflectance models, including resist-topography alignment effects [9], [6], [10], [14], [17].

• Large-system aberration analysis and distortion-correction frameworks unify error parameterization across parabolic optics and large assemblies, leveraging universal error parameters, mirror flexure analysis, and planar-array corrections to reduce distortions and enable vernier beam steering [7], [4], [5], [13], [1].