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Beam radius on cornea as a function of frequency and parameterized by beam waist radius at the corneal Center of Curvature (CoC). (a) Beam evolution with minimum spot size w0− = λ/2. The spectral components are indicated by the cool color map. The overlaid black trace corresponds to 275 GHz. (b) same as (a) but the input spot is w0+ from equation (2). (c) the resulting spot sizes on the cornea: w0− and w0+
