Figure 5.

Exposure threshold at 532 nm for dyed PS films 1–3. (a) Resulting hole diameter as a function of fluence for single laser pulses. The inset shows a series of holes in film 3 that increase in diameter with increasing fluence. The numbers identify the corresponding diameter-fluence values on the film 3 graph. (b) Dependence of exposure threshold on the fluence (per pulse) for the given number of pulses that produces the first observed (minimum diameter) hole. Dashed lines in (a,b) are included to guide the eye.