Tan, H. Y. and Ong, G. L. and Nee, C. H. and Yap, Seong Ling and Poh, Hun Seng and Tou, T. Y. and Lan, B. L. and Lee, S. F. and Yap, S. S. (2023) Thermal-induced effects on ultrafast laser filamentation in ethanol. Optics and Laser Technology, 163. ISSN 0030-3992, DOI https://doi.org/10.1016/j.optlastec.2023.109350.
Full text not available from this repository.Abstract
Fs laser filamentation in ethanol is studied for bottom-up nanomaterials synthesis at different laser repetition rate. Measurements of energy loss, visible conical images, transmitted beam profile and the optical emission spectra show that laser repetition rate affects ultrafast laser filamentation in ethanol significantly because of the induced thermal processes. Firstly, near the threshold laser energy for self-focusing, high laser repetition rate could interfere with the process, via thermal defocusing that inhibits the onset of filamentation. An enlarged, near flat-top laser beam is produced for the conditions that favor thermal lensing. Secondly, at high laser energy, thermal defocusing effect is saturated as convective heat dissipation occurs. Thus, self-focusing prevailed and led to filamentation at all repetition rates. The strong convection at high laser repetition rate increases the rate of reactions for nanodiamonds synthesis, as the flow of fresh ethanol precursor to the localized filamentation zone is enhanced.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education, Malaysia FRGS/1/2019/STG07/MMU/02/1, Sandisk/Western Digital Malaysia, Penang State Government |
| Uncontrolled Keywords: | Ultrafast laser filamentation; Nanodiamonds; Repetition rate; Critical power; Thermal lensing; Thermo-optic coefficient |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 07 May 2024 06:41 |
| Last Modified: | 07 May 2024 06:41 |
| URI: | http://eprints.um.edu.my/id/eprint/38444 |
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