Laser surface melting schematic

Schematic representation of laser surface melting (Majumdar et a ., 2003). 

In the laser flash method, a melt of interest is placed between two parallel plates. The upper plate is heated stepwise and the thermal diffusiv-ity is measured from the rise in temperature. The specific design for molten materials and especially slags employed by Ohta et al. is based on the differential three-layer technique utihzing a special cell that can be accommodated in the system. A schematic diagram of the principle of the measurement section is shown in Fig. 31. A laser pulse irradiates the upper (platinum) crucible and the temperature response of the surface of the lower platinum crucible is observed, a liquid specimen being sandwiched between the two. 

Figure 1 Schematic view of the interaction of laser light with a solid. Initial irradiation heats (a) and then melts (h) the surface. The hquid is then vaporized (c) and ionized (d) to form a plasma that is ejected away from the target surface. The time from (a) to (d) is approximately 30 ns...

---