The role of external focusing in spectral enrichment under mid-IR laser filamentation in dielectrics

Autor:	Kirill Lvov, Sergey Stremoukhov, Fedor Potemkin
Rok vydání:	2021
Předmět:	Optics Materials science Filamentation business.industry law Dielectric business Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention
Zdroj:	Journal of Optics. 23:065502
ISSN:	2040-8986 2040-8978
DOI:	10.1088/2040-8986/abfc34
Popis:	We report on the numerical investigation of spectral enrichment under mid-infrared (4.4 μm) laser filamentation in CaF2 and the influence of the external focusing on this nonlinear phenomenon. It is shown that the supercontinuum generation is related to the rapid free-electron increase and appears when nonlinear and diffraction lengths are practically the same. With further pulse propagation, the anti-Stokes wing (ASW) is formed which is caused by the pulse splitting. Looser focusing leads to pulse splitting be closer to the point of supercontinuum formation along the propagation axis. The ASW experiences a red-shift when external focusing is applied due to increased free-electron density.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0f1ccdc18768b3429b9155603961654 https://doi.org/10.1088/2040-8986/abfc34 Zobrazit plný text záznamu