Femtosecond Optical Breakdown in Dielectrics

Autor:	Ferenc Krausz, Wolfgang Kautek, M. Lenzner, Jörg Krüger, Gerard Mourou, Zhao Cheng, S. Sartania, Ch. Spielmann
Rok vydání:	1998
Předmět:	Free electron model Laser ablation Materials science business.industry Band gap General Physics and Astronomy Nonlinear optics Dielectric Laser law.invention law Ionization Femtosecond Optoelectronics business
Zdroj:	Scopus-Elsevier
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.80.4076
Popis:	We report measurements of the optical breakdown threshold and ablation depth in dielectrics with different band gaps for laser pulse durations ranging from 5 ps to 5 fs at a carrier wavelength of 780 nm. For t, 100 fs, the dominant channel for free electron generation is found to be either impact or multiphoton ionization (MPI) depending on the size of the band gap. The observed MPI rates are substantially lower than those predicted by the Keldysh theory. We demonstrate that sub-10-fs laser pulses open up the way to reversible nonperturbative nonlinear optics (at intensities greater than 10 14 Wycm 2 slightly below damage threshold) and to nanometer-precision laser ablation (slightly above threshold) in dielectric materials. [S0031-9007(98)05969-9]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::258a6a120e6d780ae4d7e42bc68e145f https://doi.org/10.1103/physrevlett.80.4076 Zobrazit plný text záznamu