Below-threshold-harmonics-generation limitation due to laser-induced ionization in noble gases

Author(s)

Felicio Zuffi, Armando Valter ; Vieira Junior, Nilson Dias ; Samad, Ricardo Elgul

• Document type: Journal article
• Source: PHYSICAL REVIEW A; v. 105, n. 2, p. 6-pg., 2022-02-28.

Abstract

This work introduces and validates a model that explains an observed upper limitation of the emission of below-threshold harmonics generated by noble gases bound electrons in a restricted region of space. The model uses fundamental parameters from the gases and the laser beam, and correctly predicts an intensity threshold above which the harmonics yield cannot be increased by raising the laser power. This restraint is a consequence from the depletion of electrons due to laser-induced ionization, which exactly compensates the harmonics yield increase with the excitation power. (AU)

• FAPESP's process: 00/15135-9 - Implementation of a terawatt laser system and its applications
• Grantee: Nilson Dias Vieira Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 05/51689-2 - Optics and Photonics Research Center at UNICAMP
• Grantee: Hugo Luis Fragnito
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC