  In this work, a new model of effective lift-off threshold of oxide/metal
target is presented. The influence of nonlinear processes in the oxide layer on
its removal from the metallic samples using picosecond laser was investigated.
Nonlinear and saturable absorption in the layer was incorporated into modeling
for prediction of effective laser lift-off threshold fluence change with
varying peak intensities in z-scan type experiment for the first time. The new
model coincides well with the experimental results.
