Volumetric modification of transparent materials with two-color laser irradiation: insight from numerical modeling

0586000 - FZÚ 2025 RIV CH eng J - Journal Article
Zhukov, Vladimir - Bulgakova, Nadezhda M.
Volumetric modification of transparent materials with two-color laser irradiation: insight from numerical modeling.
Materials. Roč. 17, č. 8 (2024), č. článku 1763. E-ISSN 1996-1944
R&D Projects: GA MŠMT(CZ) EH22_008/0004596
EU Projects: European Commission(XE) 823897 - ATLANTIC
Research Infrastructure: e-INFRA CZ II - 90254
Institutional support: RVO:68378271
Keywords : ultrashort laser pulses * material modification * bi-color irradiation * laser energy coupling * numerical simulations * Maxwell's equations
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.4, year: 2022
Method of publishing: Open access

Traditionally, single-color laser beams are used for material processing and modifications of optical, mechanical, conductive, and thermal properties of different materials. So far, there are a limited number of studies about the dual-wavelength laser irradiation of materials, which, however, indicate a strong enhancement in laser energy coupling to solid targets. Here, a theoretical study is reported that aimed at exploring the volumetric excitation of fused silica with dual-wavelength (800 nm and 400 nm) ultrashort laser pulses focused on the material’s bulk. Numerical simulations are based on Maxwell’s equations, accounting for the generation of conduction electrons, their hydrodynamic motion in the laser field, and trapping into an excitonic state. It is shown that, by properly choosing the energies of the two laser harmonics successively coupling with the material, it is possible to strongly enhance the laser energy absorption as compared to the pulses of a single wavelength with the same total energy. Laser energy absorption strongly depends on the sequence of applied wavelengths, so that the shorter wavelength pre-irradiation can yield a dramatic effect on laser excitation by the following longer-wavelength pulse. The predictions of this study can open a new route for en- hancing and controlling the highly localized absorption of laser energy inside transparent materials for optoelectronic and photonic applications.
Permanent Link: https://hdl.handle.net/11104/0353621

Scientific data in ASEP :
Dataset for Volumetric Modification of Transparent Materials with Two-Color Laser Irradiation: Insight from Numerical Modeling