Open Access
ARTICLE
HEAT TRANSFER IN METAL FILMS IRRADIATED BY COMBINED NANOSECOND LASER PULSE AND FEMTOSECOND PULSE TRAIN
Yunpeng Ren, J. K. Chen*, Yuwen Zhang
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA
* Corresponding Author: Email:
Frontiers in Heat and Mass Transfer 2012, 3(2), 1-7. https://doi.org/10.5098/hmt.v3.2.3001
Abstract
Heat transfer in a copper film irradiated by a femtosecond (fs) laser pulse train and by an integrated dual laser beam of a nanosecond pulse with a fspulse train was studied using the semi-classical two-temperature model. The critical point model with three Lorentzian terms was employed to
characterize transient optical properties for the laser energy deposition. The effects of pulse number and separation time on the thermal response were
investigated. The results showed that with the same total energy in a fs-pulse train, more pulses for shorter separation time, e.g., 1 ps, and fewer
pulses for longer separation time, e.g., 100 ps, can achieve higher lattice temperature. For a dual laser beam, the lattice temperature can be increased
by setting the pulse separation time as short as possible, e.g., 1 ps.
Keywords
Cite This Article
Ren, Y., Chen, J. K., Zhang, Y. (2012). HEAT TRANSFER IN METAL FILMS IRRADIATED BY COMBINED NANOSECOND LASER PULSE AND FEMTOSECOND PULSE TRAIN.
Frontiers in Heat and Mass Transfer, 3(2), 1–7. https://doi.org/10.5098/hmt.v3.2.3001