Effect of laser intensity on temporal and spectral features of laser generated acoustic shock waves: ns versus ps laser pulses

• DOI: 10.1364/ao.56.006902
• Publication Date: 2017-08-11T22:11:03Z
• Authors: E. Manikanta; L. Vinoth Kumar; Ch. Leela; P. Prem Kiran
• Keywords: Nanosecond; Picosecond; Intensity

Evolution of acoustic shock wave (ASW) properties generated during nanosecond (ns) and picosecond (ps) laser-induced breakdown (LIB) atmospheric air at different input intensities is presented. The intensity varied by changing the focal geometry ns ps pulses. ASW pressures are observed to follow dynamic interplay between plasma density recombination species. conversion laser energy has increased from loose tight focusing conditions. central frequencies have moved toward lower side with increasing for both ns-LIB (76-48 kHz) ps-LIB (111.2-92.1 kHz). angular distribution emissions was spark in ns- ps-LIB.