Enhanced second harmonic generation in laser-induced air plasma
Abstract
We report a systematic investigation into the processes behind a near hundred-fold enhanced second harmonic wave generated from a laser-induced air plasma, by examining the temporal dynamics of the frequency conversion processes, and the polarization of the emitted second harmonic beam. Contrary to typical nonlinear optical processes, the enhanced second harmonic generation efficiency is only observed within a sub-picosecond time window and found to be nearly constant across fundamental pulse durations spanning from 0.1 ps to over 2 ps. We further demonstrate that with the adopted orthogonal pump–probe configuration, the polarization of the second harmonic field exhibits a complex dependence on the polarization of both input fundamental beams, contrasting with most of the previous experiments with a single-beam geometry.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 08, 2023
- Source ID
- 10.1364/ol.493826
Entities
People
- Kareem J. Garriga Francis
- Mervin Lim Pac Chong
- Shing Yiu Fu
- X.-C. Zhang
- Yiwen E
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- University of Rochester