Precise baseline correction using statistical criteria in the measurement of characteristics of laser beams

Laser beam measurement using transmissive diffusion screen is the most appropriate method for wide aperture laser beams. Precise measurement requires minimizing the instrumental and methodical errors. Structure of instrumental errors and its reducing were considered in works [1,2]. In this work the method of precise baseline correction is discussed, which allow to reduce methodical error and to avoid clangers caused by highlights and uneven illumination. (paper)