The phenomenon of ultrashort laser-pulse filamentation in transparent gases and liquids is represented by the localization of laser energy in a thin string of light called filament. This string is created under the joint action of radiation self-focusing and defocusing in the plasma, which is produced by the same propagating laser pulse that limits the self-focusing collapse. Ultrashort filamenting pulse emits continuum spanning from ultraviolet to terahertz range. The origin of low-frequency terahertz (THz) radiation (0-15 THz) originates from the ionization-induced photocurrent, while the higher-frequency THz radiation comes from the Kerr nonlinearity of neutral molecules.
|Original language||English (US)|
|Title of host publication||Springer Series in Chemical Physics|
|Publisher||Springer New York LLC|
|Number of pages||9|
|State||Published - 2017|
|Name||Springer Series in Chemical Physics|
Bibliographical noteFunding Information:
We thank Professor Kaoru Yamanouchi for sponsoring our trip to Japan and his excellent organization of the first STEP symposium. We thank RFBR (15-02-99630, 14-02-31379, 15-32-20966, 14-22-02021), the Council of RF President for Support of Young Scientists (MK-8562.2016.2), RF President grant for Leading Scientific Schools (NSh-9695.2016.2), and Basis Foundation.
© Springer International Publishing AG 2017.