Abstract
Optical breakdown on Ar films is studied in an intensity range from 106 to 2 × 109 W/cm2 for wavelengths of 228, 281 and 282.8 nm. The amount of ablated H2O, N2, O2 and Ar increases quadratically with laser intensity and depends strongly on the exposure time to residual gas and on substrate temperature around 24 K. The results can be explained by a model which assumes that the dominant process causing ablation is the heating of a condensed residual gas layer by two-photon absorption.
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