Femtosecond laser-matter interactions: theory, experiments by Eugene G. Gamaly

By Eugene G. Gamaly

This is the 1st accomplished remedy of the interplay of femtosecond laser pulses with solids at nonrelativistic depth. It connects phenomena from the delicate atomic movement at the nanoscale to the iteration of maximum strain and temperature within the interplay sector restricted within an exceptional. The femtosecond laser-matter interplay has already came upon quite a few purposes in undefined, drugs, and fabrics technology. although, there is not any consensus at the interpretation of similar phenomena. With arithmetic saved to a minimal, this can be a hugely attractive and readable remedy for college kids and researchers in technological know-how and engineering.

The e-book avoids advanced mathematical formulae, and as a result the content material is out there to nontechnical readers. necessary summaries after every one bankruptcy offer compressed details for speedy estimates of significant parameters in deliberate or played experiments. The e-book connects the fundamental physics of femtosecond laser-solid interactions to a huge variety of purposes. Throught the textual content, uncomplicated assumptions are derived from the 1st rules, and new effects and concepts are awarded. From such analyses, a qualitative and predictive framework for the sphere emerges, the impression of which on purposes can be mentioned.

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Then, the Coulomb collisions of electrons with ions start contributing into the total collision rate. The Coulomb collision rate is inverse proportional to the squared energy of electrons. , 2000]. The upper temperature limit at Fig. 5 approximately corresponds to the limit of validity the theory presented above. b) Dependence of the electron–phonon interaction rates on the electron temε F , that holds perature. This dependence is weak in conditions, kB Te when the electron–phonon interaction is important.

The free electron oscillates in the laser field, E¯ = E 0 · e−i ωt , with velocity v¯ osc = e E¯ /mω. 22) α = 1 stands for the circular, α = 0 for the linear polarization. 94 eV. In what follows we consider mainly plane-polarised light. It should be noted that the circular-polarised beam possesses the orbital momentum and therefore its interaction should be treated differently from that for the planepolarised beam. , 2006] that multi-photon absorption cross section for the powerful femtosecond circular-polarised beam is much lower than for the beam of the same intensity and pulse duration but being the plane-polarised.

The unperturbed solid. It is convenient to measure the lattice temperature in units of maximum electron temperature of Eq. 17). Then Eq. 19) θ 2 + aθ − 1 = 0; θ = T/Te,m ; a = 2 π ne k2B Tem If the heating is on a moderate scale the initial temperature should be acC e and if the counted for in Eq. 18). 20) One can see comparing Eqs. 20) that maximum electron temperature is significantly larger than the maximum lattice temperature at the moderate absorbed energy: εF C L na Te,max = 2 TL ,max π ne k2B Te,max The difference between the maximum temperatures decreases at high absorbed energy density.

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