Far-field half-angle θ = λ/(πw₀); real beam θ = M²·λ/(πw₀); the smaller the waist, the larger the divergence
Run this interactive Photonics & Lasers demo live below, or download it as a single self-contained HTML file that works offline in any browser or LMS — one of 1,900+ free interactive teaching demos on Notedeck. With Notedeck you upload your own materials and turn them into interactive courseware, question papers with answer keys, and AI-taught lessons.