Heating of solid targets with laser pulses

Abstract

Analytical and numerical solutions to the heat−conduction equation are obtained appropriate to the heating of absorbing media with pulsed lasers. The spatial and temporal form of the temperature is determined using several different models of the laser irradiance. Both surface and volume generation of heat are discussed and the results obtained using each model are compared with each other and with previously known results. It is found that if the depth of thermal diffusion for the laser pulse duration is large compared to the optical attenuation depth, the surface and volume generation models give nearly identical results. However, if the thermal diffusion depth for the laser pulse duration is comparable to or less than the optical attenuation depth, the surface generation model can give significantly different results compared to the volume generation model. Specific numerical results are given for a tungsten target irradiated by pulses of different temporal durations and the implications of the results are discussed with respect to the heating of metals by picosecond laser pulses.

Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

“…Since d ( d with d denoting the plate's thickness, we set Aðx * ; tÞ ¼ 0 and model the laser as a surface heat source. 15 Combining Eqs. (1) and (2) results in the three dimensional nonlinear heat conduction equation…”

Infrared Investigations of the Neutral-Ionic Phase Transition in TTF-CA and Its Dynamics

“…The time-dependent evolution of the temperature was theoretically studied comprehensively by Bechtel [101]. An exact description of the equation can be found in Appendix D. When solely the sample surface was heated up by the laser beam, the change of the surface temperature ∆T(t) can be derived from the following equation:…”

Non-linear optical studies of adsorbates: Spectroscopy and dynamics

“…For LiNb03 crystal, if we choose OOt = 2rtcfA.t with At = 3.3 jlm, and W2 = 2rccfA.2 with A.2 = 0.532 jlm, (41) assuming that both the signal and the pump pulse have the same duration, tp = lx 10-12 s,…”