Abstract
We consider expansion, break off, and flight of 10 nm molybdenum film deposited onto glass support. These events are initiated by action of subpicosecond laser pulse onto film. Approximations for two-temperature equation of state and electron–ion coupling parameter are developed. Heat conduction is unimportant because film is ultrathin and because radius of a laser beam is rather large ∼ 10 µm (thus lateral thermal spreading is insignificant at the considered time scale). We use two-temperature one-dimensional hydrodynamic code to follow evolution of laser induced flow. Additional code for treating transmission and reflection of a monochromatic electromagnetic wave is developed. It is applied to describe interference between transmitted and reflected waves in the layered structure appearing thanks to laser induced expansion and separation of a film.
Highlights
Thermodynamic functions of molibdenum Important direction in physics of laser–matter interaction is connected with ultrashort laser pulses (UsLP)
The range of moderate fluences begins around melting threshold Fm for bulk metal targets and continues up to ∼ (102–103)Fm, see [1]
In absorbed fluences Fabs, the melting threshold Fabs|m is of the order of few tens of mJ/cm2 for bulk metal targets
Summary
There are three ranges of their fluences F : weak, moderate, and strong. The range of moderate fluences begins around melting threshold Fm for bulk metal targets and continues up to ∼ (102–103)Fm, see [1]. In absorbed fluences Fabs, the melting threshold Fabs|m is of the order of few tens of mJ/cm for bulk metal targets. There are two subranges of high fluences above the moderate range. They are below [2,3] and above [4,5,6] the relativistic intensity ∼ 1018–1019 W/cm. They are below [2,3] and above [4,5,6] the relativistic intensity ∼ 1018–1019 W/cm2 At this intensity the quivering kinetic energy of electron oscillations in
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