Figure 9

(Color online) Double freeform-surface lens designed (Lens II) by providing the distribution of the deviation angle. The ratios of the first and the total deviation angles are (a) 0, (b) 0.25, (c) 0.33, (d) 0.50, (e) 0.66, (f) 0.70, (g) 0.75, (h) 0.80, and (k) 1.0.