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Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses
- Source :
- JETP Letters
- Publication Year :
- 2019
-
Abstract
- 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.
- Subjects :
- 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)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- JETP Letters
- Accession number :
- edsair.doi.dedup.....f64ec0bcdeffda618e91d7560dcc4148