Work

Saddle point analysis on selective enhancement of high-order harmonic generation

Year: 2024

Type: article

Abstract: We theoretically demonstrate control of selective enhancement of the near-cutoff odd order harmonic generation by dual-color chirped laser field. The sharp enhancements of a single harmonic order ranging from H37 to H59 ( λ h =21.6nm-13.5nm) are achieved by adjusting the intensity of the fundamental frequency field. The saddle point method is applied to the analysis of high-order harmonic generation using the distorted-waveform laser field. A series of orbits of principal contribution to enhancement are extracted using the saddle point method, and the enhancement of the key orbits’ interference is reconstructed by quantum orbital theory. Through the analysis of the interference mechanism of enhancement, we give a full explanation of the dependence of enhanced harmonic order on laser intensity.

Source: Optics Express

DOI: 10.1364/oe.542434

Authors: Zhi-hong Jiao, Tian-xiang Ma, Sheng Zhang, Jin-xu Du, Guo-li Wang, Song-feng Zhao

Institution: Nanjing University of Science and Technology

Language: English

Topic: Laser-Matter Interactions and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China