Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses
| Autor: | Andrey A. Ionin, D. Milovanović, Nikita Smirnov, Sergey A Uryupin, S. G. Bezhanov, Biljana M. Gaković, Sergey I. Kudryashov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Fermi level Pulse duration Laser 7. Clean energy 01 natural sciences Two-photon absorption 010305 fluids & plasmas law.invention Wavelength symbols.namesake law Attenuation coefficient 0103 physical sciences Density of states symbols Atomic physics 010306 general physics Absorption (electromagnetic radiation) |
| Zdroj: | JETP Letters |
| Popis: | The dependences of the depth of single-pulse ablation of the steel surface on the energy density of ultrashort laser pulses (0.3–12 ps) with a wavelength of 515 nm have the form different from the usual logarithmic one for linear absorption of radiation. Since the density of states of free conduction electrons in the s band is low, and the d band of strongly bound electrons with a high density of states is located around the Fermi level, these dependences have been approximated within the two-photon absorption model. The two-photon absorption coefficient increases almost linearly with the duration of laser pulses, which indicates the saturation of absorption and allows estimating the corresponding parameters of the electronic subsystem. © 2019, Pleiades Publishing, Inc. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|