Analysis and mitigation of crosstalk in a multi-parameter laser beam diagnostic system

Accurate characterization of laser beams is crucial for applications ranging from laser-based material processing to gravitational wave detection, where even minor measurement deviations can significantly impact system performance. We investigate crosstalk effects in a multi-parameter laser beam diagnostic system designed to simultaneously measure six beam parameters: pointing angles, centroid positions, wavefront curvature, and beam diameter. Using sequential ray-optical simulations in Zemax, a comprehensive analysis of parameter interdependencies is performed through a systematic parameter sweep across 15,625 unique combinations within specified measurement ranges. The results reveal significant crosstalk effects between several parameters, which are traced back to specific optical components in the system. To address these issues and improve accuracy, a mathematical framework for crosstalk mitigation based on Taylor series expansions is developed. The mitigation method reduces measurement deviations significantly by up to one order of magnitude. This work provides insights into the origins and mitigation of crosstalk effects in optical measurement systems, particularly relevant for high-accuracy applications.