Electronic and vibrational processes in absorbing liquids in femtosecond laser sub- And filamentation regimes: Ultrasonic and optical characterization
LASER PHYSICS LETTERS(2020)
Abstract
The ultrasonic characterization of the propagation of femtosecond laser pulses in pure transparent water and colored phenol-red dye solutions at variable concentrations indicates their thermoacoustic pressure generation due to intrinsic multi-photon absorption in the low-power sub-filamentation regime and sub-linear pressure response of sub-critical plasma via free-carrier absorption in the filamentation regime. Multi-photon absorption appears to be concentration dependent for water and dye solutions, while plasma absorption demonstrates a universal trend for all these liquids. In the filamentation regime, through the non-linear laser-matter interactions, not only new optical frequencies (intense white-light supercontinua) were generated, but supercontinuum-based ultrafast broadband spectroscopy in the filaments also revealed many additional transient absorption bands of the dye molecules, induced via power-dependent and concentration-independent stimulated Raman scattering.
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Key words
ultrashort laser pulses,water,filamentation,ultrasonic acquisition,ultrafast broadband spectroscopy,stimulated Raman scattering
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