by George D. Tsibidis and Emmanuel Stratakis
Abstract:
Irradiation of solids with ultrashort pulses and laser processing in the mid-Infrared (mid-IR) spectral region is a yet predominantly unexplored field with a large potential for a wide range of applications. In this work, laser driven physical phenomena associated with processes following irradiation of fused silica (SiO2) with ultrashort laser pulses in the mid-IR region are investigated in detail. A multiscale modelling approach is performed that correlates conditions for formation of perpendicular or parallel to the laser polarisation low spatial frequency periodic surface structures for low and high intensity mid-IR pulses (not previously explored in dielectrics at those wavelengths), respectively. Results demonstrate a remarkable domination of tunneling effects in the photoionisation rate and a strong influence of impact ionisation for long laser wavelengths. The methodology presented in this work is aimed to shed light on the fundamental mechanisms in a previously unexplored spectral area and allow a systematic novel surface engineering with strong mid-IR fields for advanced industrial laser applications.
Reference:
George D. Tsibidis and Emmanuel Stratakis, “Ionisation processes and laser induced periodic surface structures in dielectrics with mid-infrared femtosecond laser pulses”, In Scientific Reports, vol. 10, no. 1, pp. 8675, 2020.
Bibtex Entry:
@article{tsibidis_ionisation_2020,
	title = {Ionisation processes and laser induced periodic surface structures in dielectrics with mid-infrared femtosecond laser pulses},
	volume = {10},
	copyright = {2020 The Author(s)},
	issn = {2045-2322},
	url = {https://www.nature.com/articles/s41598-020-65613-w},
	doi = {10.1038/s41598-020-65613-w},
	abstract = {Irradiation of solids with ultrashort pulses and laser processing in the mid-Infrared (mid-IR) spectral region is a yet predominantly unexplored field with a large potential for a wide range of applications. In this work, laser driven physical phenomena associated with processes following irradiation of fused silica (SiO2) with ultrashort laser pulses in the mid-IR region are investigated in detail. A multiscale modelling approach is performed that correlates conditions for formation of perpendicular or parallel to the laser polarisation low spatial frequency periodic surface structures for low and high intensity mid-IR pulses (not previously explored in dielectrics at those wavelengths), respectively. Results demonstrate a remarkable domination of tunneling effects in the photoionisation rate and a strong influence of impact ionisation for long laser wavelengths. The methodology presented in this work is aimed to shed light on the fundamental mechanisms in a previously unexplored spectral area and allow a systematic novel surface engineering with strong mid-IR fields for advanced industrial laser applications.},
	language = {en},
	number = {1},
	urldate = {2021-01-26},
	journal = {Scientific Reports},
	author = {Tsibidis, George D. and Stratakis, Emmanuel},
	month = may,
	year = {2020},
	note = {Number: 1
Publisher: Nature Publishing Group},
	pages = {8675},
	file = {Full Text PDF:C:\Users\abm50\Zotero\storage\YWX24HGR\Tsibidis y Stratakis - 2020 - Ionisation processes and laser induced periodic su.pdf:application/pdf;Snapshot:C:\Users\abm50\Zotero\storage\I3G7UDQ8\s41598-020-65613-w.html:text/html}
}