Determination of the Ion Temperature in a Stainless Steel Slab Exposed to Intense Ultrashort Laser Pulses

Abstract

We present an effective approach to determine the amount of energy absorbed by solid samples exposed to ultrashort laser pulses, thus, retrieving the maximum temperature attained by the ion lattice in the picosecond time scale. The method is based on the pyrometric detection of a slow temperature fluctuation on the rear side of a sample slab associated with absorption of the laser pulse on the front side. This approach, successfully corroborated by theoretical calculations, can provide a robust and practical diagnostic tool for characterization of laser-generated warm dense matter.

EIS: the scattering beamline at FERMI

“…The main purpose is to gain control over the spatial distribution of the energy density deposited onto the sample; however, applications can be various. Non-negligible beam tails would, for example, make possible a direct measurement of the sample temperature raising with an infrared pyrometer, following the lines described by Principi et al (2012).…”

Reflectivity enhancement in titanium by ultrafast XUV irradiation

“…FEL-based experiments have provided valuable new insights into this field, for example saturable absorption by core electrons at XUV/x-ray wavelengths8 or depression of the ionization potential in solid-density plasma9. Other FEL-based experiments aimed at the determination of the relevant parameters of these highly excited states of matter have been proposed, such as x-ray induced changes in optical reflectivity101112, the parallel pyrometrical characterization of heat waves for the determination of the ion temperature ( T i )13 or Thompson scattering for the determination of both free electron density ( N e ) and temperature ( T e )14. The latter approach is based on the measurement of the plasmon lineshape in the inelastic scattering spectra of the excited sample.…”