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Modeling laser ablation impulse of polymers in vapor and plasma regimes
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Image of FIG. 1.
FIG. 1.

Fluence required for plasma ignition on targets in vacuum from 100 fs to 1 ms pulse duration: . This plot shows that less pulse energy is required to form plasma as decreases, down to about 100 ps. Data labels are explained in Refs. 11 and 12.

Image of FIG. 2.
FIG. 2.

Plasma model fitting of published data for on C–H materials, adapted from Ref. 2. Four data subsets were used with distinct Saha equations, including short pulses in UV (Turner, 248 nm, 22 ns) and near IR (Grun, , 5 ns); and long pulses in near IR (Afanas’ev, , 1.5 ms) and mid IR (Gemini, , ). Fitting curves are given for each data set. Names and data labels are explained in Ref. 2.

Image of FIG. 3.
FIG. 3.

Equation (14) predicts pulsed laser ablation below and perhaps slightly into the plasma regime. Each point is averaged from 5 to 10 shots, and parameter estimates from modeling and experimental error bars are included ( is one standard deviation).

Image of FIG. 4.
FIG. 4.

A combined model for , showing fit to data from vaporization onset into the plasma regime.


Generic image for table
Table I.

Predictions for optimal coupling at low fluence.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modeling CO2 laser ablation impulse of polymers in vapor and plasma regimes