Electron-lattice relaxation time dynamics and separation time dynamic of multiple pulse femtosecond laser ablation process on gold.

Hardik Vaghasiya; Stephan Krause; Paul-Tiberiu Miclea

doi:10.1117/12.2631208

31 May 2022 Electron-lattice relaxation time dynamics and separation time dynamic of multiple pulse femtosecond laser ablation process on gold.

Hardik Vaghasiya, Stephan Krause, Paul-Tiberiu Miclea

Author Affiliations +

Proceedings Volume 12132, Advances in Ultrafast Condensed Phase Physics III; 121320C (2022) https://doi.org/10.1117/12.2631208
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Conference Poster

Abstract

A fundamental study of the interaction of ultrashort pulses and metal will be useful for predicting the ablation morphology and optimizing the process parameters. To study the ultrashort laser pulse interaction on gold, a set of coupled partial differential equations of the two-temperature model was solved in the spatial and time domains with dynamic optical properties and phase explosion mechanism. In an extended Drude model which also takes into account inter-band transitions, the reflectivity and absorption coefficient are contemplated based on the electron relaxation time. The laser energy deposition and phase explosion ablation mechanism are analyzed in the case of succession of laser pulses on the gold with experimental results for fundamental wavelength 1030 nm and fluence ranging from 3 J/cm² to 18 J/cm². Electron-lattice thermal relaxation time and separation time are important factors for multi-pulse laser ablation and have been studied. The simulation results demonstrate that by increasing the number of pulses with a shorter separation time compared to electron-lattice thermal relaxation time, lattice temperature can be considerably increased without a noticeable increase in ablation depth. In the study of multiple pulses femtosecond laser ablation, the computational model indicates that succession of laser pulses with a pulse separation time of 50 ps or longer can significantly boost the ablation rate at the same laser fluence. Thus, the deviation from experimental and simulation results gives rise to the conclusion that temporal pulse manipulation with separation time greater than the electron-lattice relaxation time is a useful technique for increasing ablation rate in industrial fast femtosecond laser processing.

Citation Download Citation

Hardik Vaghasiya, Stephan Krause, and Paul-Tiberiu Miclea "Electron-lattice relaxation time dynamics and separation time dynamic of multiple pulse femtosecond laser ablation process on gold.", Proc. SPIE 12132, Advances in Ultrafast Condensed Phase Physics III, 121320C (31 May 2022); https://doi.org/10.1117/12.2631208

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available