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Experimental investigation of laser damage to thin metal films using a quartz resonator
S. M. Metev
, V. P. Veĭko
,
K. V. Stamenov, Kh. A. Kalev
Abstract:
An experimental investigation was made of some of the conclusions of the two-phase model of laser damage to thin absorbent films. A new investigation method was applied and this allowed accurate quantitative measurements to be made of the variation in the mass of the film on exposure to laser radiation. The thresholds
q1 and
q2 for initial and total damage to the film were measured using the experimentally determined dependence of the thickness of the evaporated layer
h on the light flux density
q. The theoretical dependences
q1,2(
H),
q1,2(τ), and
q1,2(
A) (
H is the film thickness, τ is the duration of the laser pulse, and
A is the reflectivity of the film) were confirmed experimentally. The experiments supported the conclusion of the two-phase model that, when the dimensions of the illuminated zone are large
d≫√κτ,
d≫
Hwi /
vf (
d is the diameter of the illuminated zone, κ is the thermal diffusivity of the film,
wi is the velocity of the melt, and
vf is the velocity of the evaporation boundary of the film), the damage process is accurately described by the evaporation model.
UDC:
539.216.22:669
PACS:
61.80.-x, 68.60.+q
Received: 06.12.1976